ASLA Supports Coalition to Save the Amazon Rainforest

SOS Amazonia / Lucas Peries

The Amazon rainforest is one of the world’s most precious ecosystems. It provides 6 percent of the oxygen produced on the planet. It stores an estimated 100 billion tons of carbon – about 17 percent of the world’s carbon – in its trees and plants.

This year alone, about 80,000 fires have raged across the forest, more than an 80 percent increase over 2018. Through July 2019, over 7,200 square miles of the Brazilian rainforest were burned, an aggregated area roughly the size of New Jersey. We can and must do more to protect the Amazon and avoid catastrophic consequences.

The American Society of Landscape Architects (ASLA) supports our global sister organizations, led by Iniciativa Latinoamericana del Pasisaje (Latin American Landscape Initiative, LALI) and the International Federation of Landscape Architects (IFLA), as they work to quell the flames, prevent further deforestation, and protect the Amazon rainforest.

To see what you can do to help, visit:

The Amazon Conservation Team

The Amazon Conservation Association

SOS Amazȏnia

We Are Designing the Earth, Whether You Like It or Not

“The Monk by the Sea” by Caspar David Friedrich (1808) / Wikimedia

This purpose of this article is to reflect on the Design with Nature Now exhibition that ran over this past summer at the Stuart Weitzman School of Design at the University of Pennsylvania. The exhibition marked the 50th anniversary of Ian McHarg’s 1969 tome Design with Nature and was curated by Fritz Steiner, FASLA, Karen M’Closkey, Billy Fleming, ASLA, Bill Whitaker, ASLA, and myself.

As curators we worked for well over a year to select the 25 works in the exhibition. We began by asking colleagues around the world for project recommendations. We stipulated in some detail that projects had to be “McHargian” in scale and scope. From well over a hundred nominations, we reached the short list of 25 and organized them into five categories: Big Wilds, Urban Futures, Toxic Lands, Fresh Waters and Rising Waters, which can be explored online.

Big Wilds

• Great Green Wall, Africa
• Yellowstone to Yukon Conservation Initiative, USA and Canada
• National Ecological Security Pattern Plan, China
• Malpai Borderlands, Arizona and New Mexico, USA
• Samboja Lestari, East Kalimantan, Indonesia
• Landscape Regeneration of Western Waiheke Island, New Zealand

Urban Futures

• Willamette River Basin Oregon, USA
• Qianhai Water City Shenzhen, China
• Envision Utah Salt Lake City Region, USA
• Medellin, Colombia
• Barcelona Metropolitan Region Plan, Spain

Toxic Lands

• Emscher Landscape Park, Ruhr Valley, Germany
• Stapleton, Denver Colorado, USA
• Freshkills Park, New York, USA
• Queen Elizabeth Olympic Park, London, England

Rising Waters

• The BIG U, New York, USA
• A New Urban Ground New York, New York, USA
• Fingers of High Ground Norfolk, Virginia, USA
• Zandmotor Ter Heijde, The Netherlands
• 2050—An Energetic Odyssey North Sea, The Netherlands

Fresh Waters

• Healthy Port Futures Great Lakes Region, USA
• Room for the River The Netherlands Rijkswaterstaat
• Los Angeles River Master Plan California, USA
• Weishan Wetland Park Jining, China
• GreenPlan Philadelphia Pennsylvania, USA

It’s important to note the final list of projects doesn’t mean we completely endorse the work, nor is the exhibition a collection of the “best of.” This is not an awards forum; it is a representative selection of work that we think does a pretty good job of scoping, extending, and in some cases questioning McHarg’s legacy into the 21st century.

Without being too coy about it, we generally think these projects indicate important directions for the future of the profession. A criticism we accept and have worried over is the collection is geographically and culturally quite limited, itself a reflection of landscape architecture’s current professional reach.

So what do we mean by extending McHarg’s legacy? Simply, the works we’ve chosen tend to be “plannerly,” that is, they are big in terms of site and timescale and tend to involve complex socio-political and ecological processes with multiple authors and agencies. In short, there are no gardens, plazas, or streetscapes (to name but a few types) in this collection. This is not to say these are unimportant, they just don’t fit the raison d’etre, or the occasion of this exhibition.

Turning to the question of designing a planet: the functionalist definition of design is to make a tool that will do something more effectively than prior to the tool’s existence. But what’s most important about this—at least what largely seems to distinguish us to some degree from many other species—is that the invention of the tool, or the desire for the invention of the tool, takes place in our minds before it takes place in the world.

Without wanting to at all elevate humans above other species, we do have an exceptional propensity for imagining causality. In a word, we have foresight.

In Greek mythology foresight was the special gift of Prometheus – the father of humanity. We, the “Anthropos” (meaning not only humans, but also “the lower ones”), received our ability for foresight from Prometheus. Under instruction from Zeus, who wanted some pets to alleviate his boredom, Prometheus made the Anthropos out of clay taken from somewhere between the Tigris and Euphrates, and with the admixture of Athena’s breath, here we are!

As the story goes, Zeus told Prometheus to give the Anthropos some degree of free will so as to make them more entertaining, but he stressed not to give them so much that they might then compete with the Gods themselves. Of course, by giving us not only a modicum of foresight, but also fire, Prometheus gave us everything we needed to do exactly what Zeus feared we would. And the rest, as they say, is history.

Suomi NPP launch by NASA/Bill Ingalls, public domain via NASA.gov

From the origin of the Anthropos we can trace an arc to the 1960s when, just before McHarg released his manifesto, Stewart Brand, the man responsible for persuading NASA to release the original earth image, pronounced: “We are now as Gods and should get good at it.” This is a hugely significant thing to say, but what’s more is that Brand recently updated his statement to “we are as Gods and MUST get good at it.”

In other words, not only have the Gods abandoned us, but we are now so deeply implicated in the workings of the Earth system that we really have no choice but to try and design it. In so far as we know, for the first time in evolutionary history, there is now a form of networked planetary intelligence registering its own environmental predicament. If so, then humanity is the first species in evolutionary history to attempt to design a planet, a fact as preposterous as it is, according to Brand, a necessity.

The poster child for the historical drama in which we now cast ourselves as both the villain and the hero is the atmospheric chemist Paul Crutzen, who popularized the term Anthropocene. As Crutzen explains, the Anthropocene is an act in three parts: first, the industrial revolution; second, the great acceleration (consumer-driven capitalism since 1950); and now he says we should move into a third phase in which we begin to, and I quote, “steward the earth.”

This of course is exactly what McHarg said 50 years ago. Now you might say that we have already designed the planet. Certainly, humanity has colonized and impacted every square inch of the earth’s surface, but we haven’t really done this with foresight. Until recently, we haven’t done it in a way that is self-conscious in regard to the problem of the tragedy of the commons. The question now is not whether we should design the planet, but how. Ironically then: If it’s true that species naturally over consume their environments to their own detriment, then since we have no major predator, we now need to learn to become unnatural. And in a further semantic twist, according to McHarg and his disciples, we can only do this by designing with nature.

However, the problem is this assumes we know what nature is. Truth be told, we do not. Accepting that fact is important because it protects us against anyone ever using nature as justification for authoritarian politics or any number of other oppressive ideas. Accepting then the partiality of knowledge, all we can do is develop approximations of how nature works and try different ways of productively coexisting with it as such.

We write in the introduction to the exhibition’s eponymous book that by asserting the sum-total of what we mean by design (human foresight) could be based on a singular—and in McHarg’s case, a scientific idea of nature—McHarg created a significant intellectual problem for himself and the profession. This problem is brought to light by Ursula Heise during a keynote at the Design with Nature Now conference, which was held at Penn alongside the exhibition in June, 2019.

Heise explains “the basic goal of cultural studies for the last twenty years has been to analyze and in most cases, to dismantle appeals to ‘the natural’ or ‘biological’ by showing their groundedness in cultural practices rather than facts of nature. The thrust of this work, therefore, invariably leads to skepticism about the possibility of returning to nature as such or of the possibility of places defined in terms of their natural characteristics that humans should relate to.”

Design with Nature Now / Lincoln Institute of Land Policy, 2019

Correct though she may well be, the problem with this postmodern skepticism is that if nature is not one thing, it’s everything. And if its everything, its nothing, and if it’s nothing, it can’t very well guide our designs, let alone an entire civilization as McHarg intended.

How then are we to respond to the conditions of ecological crisis? Well, you don’t have to agree with McHarg’s teleology of humanity fitting into a certain idea of nature to accept and use the sheer practicality of his method. Inversely, you also don’t need to be debilitated by the recognition that post-modern nature is a cultural construct. On the contrary, recognizing the design of nature as a cultural construct can be completely consistent with an ecological world view, just not a tyrannical one.

The ecological crisis and the misuse of land that McHarg directly confronted is not just a postmodern cultural construct – it is an appalling reality and McHarg’s importance is that he proposed a simple, replicable, and practical method for addressing it.

McHarg represents then the beginning of modern culture taking responsibility for the land with modern technology. Other societies throughout history have done this in different ways, but a modern method suited to the abstraction of modern development processes had to be created. People like Geddes, Mumford, Leopold, Carson and others provided the narrative and McHarg the method. And that he did this is enough. We don’t need to make him into anything more or less than that.

Designing with Nature Now means designing with the new nature of the Anthropocene. And to understand the Anthropocene we need to turn to both the sciences and the arts. The scientific bible for the landscape of the Anthropocene is, I think, the book Global Change and the Earth System, published in 2005. It is to the Anthropocene what the encyclopedia was to the Enlightenment.

Global Change and the Earth System / Springer

To quote directly from its introduction, the book’s purpose is “to describe and understand the interactive physical, chemical, and biological processes that regulate the total earth system, the unique environment it provides for life, the changes that are occurring in that system and the manner in which these changes are influenced by human actions.” This last expression “…the manner in which these changes are influenced by human actions” is critical because this is not the study of nature as something separate to culture; this is now the study of nature as culture.

Global Change and the Earth System is the work of literally thousands of scientists, all bringing their various models of different phenomena together in an attempt to form a complete, holistic model of the Earth System. The idea being that if we can at least better understand how the Earth system functions then we can make more informed decisions about our actions within that system.

One can imagine the ecological revolution in design, which McHarg catalyzed in regard to settlement patterns and which we are still in the early historical phases of, now means that everything we design will increasingly be conceived, tested, and valued as to how it performs within the larger material flows of the Earth system as a whole. Hyper-McHarg, if you will.

Now, while the scientists are working on their empirical models, the question in the arts is not so much how the Anthropogenic Earth works but what the Anthropogenic Earth means. To wit, just look at the plethora of recent books that use the word Anthropocene in their titles. Notably, almost all are dramatic and apocalyptic. Indeed, thoughout the humanities, there is evidently outright panic about the advent of the Anthropocene. And rightly so, because the old idea of nature as something stable and inviolable, history’s backdrop, has literally just evaporated into the carbon-saturated atmosphere of our own making.

To help make some sense of this panic, I’ve added some keywords to a sample of books on the topic of the Anthropocene (see larger version of the image below). These keywords establish polarizations that demarcate spectrums of current thought, at least as I read it. The first polarization concerns the question of whether or not we should even be calling this the Anthropocene. For its critics, the term naturalizes climate change and casts a new colonizing term over the entirety of the human race, many of whom have had very little to do with the industrial modernity that created the problem in the first place. Instead, they argue this should be called the Capitolocene, which is to say climate change must be apprehended as a cultural matter, and the blame for its advent placed squarely at the feet of first-world capitalism, and presumably communism, since it too has had an appalling environmental record.

Montage of book covers and keywords related to the Anthropocene / Richard Weller

First, with regard to the politics of the environmental movement I would place Eco-socialists at one end of the spectrum and Eco-modernists at the other. For the Eco-socialists, technology (unless its green) is a problem before it is a solution, and it is only through a return to communitarian, small scale, low-population, stable-state economies that true sustainability can be achieved. For the Eco-socialists, only the worst of climate change can now be avoided, whereas for the Eco-modernists, modernity is an incomplete project, and through technological rationality the best is yet to come, or at least, the worst can be avoided.

For Eco-socialists climate change warrants socio-political and theological revolution, something Clive Hamilton, the author of Defiant Earth: The Fate of Humans in the Anthropocene, for example, calls a “rupture” with history. On the other hand, for the Eco-modernists, history since the agricultural revolution is a continuing saga of environmental modification at the hands of technology. In this sense, even though there is now more at stake, for the Eco-modernists we are just doing now what we’ve always done. This latter position is effectively that taken by the other keynote speaker at the Design with Nature Now conference, the geographer Erle Ellis.

Second, to translate this spectrum of environmental thought into design discourse, I use the terms mitigation and adaptation respectively. Taken seriously, mitigation means taking on the causes of climate change, not only the fossil fuel industry, but also the economics of capitalism and the the philosophy of liberal humanism. Adaptation, on the other hand, means adjusting to the conditions of a changed climate but not necessarily changing its causation and certainly not changing the fundamentally-modern belief in techno scientific rationality to solve our environmental and socio-economic problems.

Per McHarg, adaptation means fitting ourselves benignly into the landscape. But this now seems way too pastoral for a planet of 8 billion people in the throes of rapid climate change. More likely and more frightening is that adaptation will become the rationale for climate engineering: regulating the albedo of the atmosphere and the chemistry of the oceans, and planning vast landscapes so they not only feed us, but also help stabilize the carbon and nitrogen cycles.

Both adaptation and mitigation point towards what is now routinely referred to as resilience. Even though in the illustrative diagram I am situating resilience equidistant between adaptation and mitigation, I think resilience theory and practice tends more towards adaptation than it does mitigation.

The reason for this is that the utopia of sustainability, which is what mitigation implies, has by now proven itself to be something of an impossibility. Accordingly, resilience has been criticized as sustainability without hope. In other words, for its critics, resilience is seen as abandoning any possibility of mitigating the environmental and social crises of modernity. Instead, we, and in particular the poor, must now learn to live with the symptoms. In this sense resilience is palliative, conservative, and at worst complicit in preserving the very systems that created the risk in the first place.

Maybe so, but this is all a little too black and white. I would also add that resilience is realistic, whereas mitigation is hopelessly idealistic. Resilience brings sustainability closer to the indeterminate way that both the natural and cultural worlds actually work. Whereas sustainability was based on an idealized ecology of equilibrium, resilience is based on an interpretation of nature as a state of disequilibrium. I think McHarg hoped ultimately for a world of equilibrium between the natural and the cultural but seems now that this is just not the way the world works.

Turning briefly now to the projects in the Design with Nature Now exhibition, there are two particular aspects of McHarg’s legacy that I want to channel. The first is his aspiration for large-scale impact and the second is his anticipation and use of digital technology. The first is what I call Big Plans and the second is Digital Natures.

Let’s start with Big Plans. On the map below, Global Landscape Connectivity Projects, you see most of the major conservation projects planned or under construction in the world today. This is an extraordinary image because it shows humans now, for the first time in (modern) history, actively and intentionally reconstructing ecosystems at a planetary scale – so yes, effectively designing a planet, or at least treating it as a garden instead of a mine. (See larger map).

Global Landscape Connectivity Projects / Richard Weller, Claire Hoch, and Chieh Huang

McHarg would love this map and it should give us all hope. And yet from a professional perspective much of this restorative activity doesn’t currently involve landscape architects. That we think it should is why we’ve included projects such as the Yellowstone to Yukon (Y2Y) Conservation Initiative in the United States and the Great Green Wall across sub-Saharan Africa in the exhibition.

Yellowstone to Yukon (Y2Y) Conservation Initiative / Y2Y.net
Great Green Wall / United Nations Food and Agriculture Organization (FAO)

For example, the Y2Y is a remarkable ongoing story of collaboration (and tension) between land owners over some 2,000 miles of territory in order to create landscape connectivity for species migration. The Great Green Wall is also a remarkable story of what began as a top-down initiative to resist the southward encroachment of the Saharan desert but has since evolved in to a mosaic of bottom-up initiatives to boost local agrarian economies across the 14 impoverished nations it comprises. When completed, if ever that day comes, the Great Green Wall will be the largest living thing ever created by humanity.

A third Big Plan, I’d like to single out that is versed in McHargian methods is the 2008 National Ecological Security Patterns for the whole of China by landscape architecture firm Turenscape, which was founded by Kongjian Yu, FASLA, and the Peking University Graduate School of Landscape Architecture. The plan shows where the ecological security of land in China should be prioritized.

Framework for national security ecological patterns / Turenscape
Ecological security pattern for biodiversity conservation / Turenscape

This research coincides with President Xi Jinping’s 2013 declaration that China should transition from a Gross Domestic Product (GDP)-focused civilization to an ecological civilization. And in this regard, while the study represents a powerful breakthrough for landscape architects, it is also something of a Faustian bargain. It raises the question of whether plans done in the name of national ecological health for totalitarian governments could come to overrule local culture in the same way development projects previously did in the name of the national interest. Imagine mass evictions not for hydroelectric dams, but now for biodiversity corridors.

Regarding the second aspect of McHarg’s legacy, the theme of Digital Natures relates to how landscape architects today are increasingly able to simulate environmental conditions in order to guide design decisions. There are two aspects to this. The first is the ability to create one’s own data instead of just passively receiving it from an authority, and the second is the increasing capacity to model complex, chaotic systems such as hydrology, and perhaps eventually entire ecosystems, cities, and ultimately the Earth system itself, as we see in the case of the book Global Change and the Earth System.

The key here is being able to model systems in the fourth, not just the third, dimension. That is, we are moving into an era where the old problem of a map being redundant the moment it is drawn can finally be overcome. It is early days in the emergence of the genre of Digital Natures, but the work of academic practitioners such as Keith Van Der Sys, Karen M’Closkey, Bradley Cantrell, ASLA, Justine Holzman, Sean Burkholder and Brian Davis — all of whom are variously modelling fluvial landscapes — is promising.

For example, the Healthy Port Futures project in the Design with Nature Now exhibition by Burkholder and Davis foregrounds digital modelling to predict sediment flows in the world’s largest inland water body, the Great Lakes of the USA and Canada. The project centers on creating simulations to show how instead of being treated as a useless waste product, sediment can be redirected so as to create new landscapes of ecological and social value. Stemming out of the academic Dredgefest initiative, Burkholder and Davis’ work is significant for its methods and also because with it they are muscling their way into territory otherwise dominated by engineers.

Contextually calibrated alternatives for passive sediment management for Lorain, Ohio / Sean Burkholder and Brian Davis: Healthy Port Futures

Which leads to what is for me the most extraordinary and perhaps the most compelling work in the exhibition: the so called Sand Motor (Zandmotor) constructed in 2011 off the coast of the Netherlands. The Sand Motor is a novel approach to coastline protection in which sand is mined offshore and added to the beach at a strategic location so that the littoral drift steadily redistributes the material further along the coast, thus reinforcing Holland’s coast against the sea. This could only be done through predictive modelling of the coastal system. Absent recent advancements in computing power, such analysis would have been previously prohibitive. Now, not only could the Sand Motor’s behavior be accurately predicted before it was built, it is also continually monitored, establishing a feedback loop between the digital and the real.

Zandmotor by Rijkswaterstaat

The Sand Motor marks a new technological and predictive level of human engagement with the environment, one that will expand at both macro and micro scales this century. In addition to designing gardens, parks, and plazas as we always will, the kind of systems design the Sand Motor suggests it is as foreboding as it is promising.

Even if unintentionally, the sand motor is also, I think, a highly aesthetic work. In fact, I’d go so far as to say it is one of the great artworks of the early Anthropocene, something land artist Robert Smithson pointed to 50 years ago. I imagine a scene where Professor Marcel Stive, the lead engineer of the Sand Motor, now replaces Caspar David Friedrich’s Monk by the Sea, not to contemplate God’s awesome creation, but rather ours.

And that brings me full circle to where I began with origin of the Anthropos. For if we have now become Gods then, for all their complexity and contradiction, I do think the projects in the exhibition show that we can be good at it.

This post is by Richard Weller, ASLA, the Martin and Margy Meyerson chair of urbanism, professor and chair of landscape architecture, and co-director of the McHarg Center for Urbanism and Ecology at the University of Pennsylvania.

The U.S. Army Corps of Engineers Turns to Nature

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Engineering with Nature: An Atlas / U.S. Army Corps of Engineers

“We rely on natural processes and landscapes to sustain human life and well-being. Our energy, water, infrastructure, and agricultural systems use these processes and landscapes to satisfy our most basic human needs. One motivation, therefore, for protecting the environment is to sustain the ecosystem goods and services upon which we depend. As we emerge from the sixth decade of modern environmentalism, there is a growing international awareness of opportunities to efficiently and effectively integrate natural and engineered systems to create even more value.”

One might understandably think this was written by a landscape architect, or excerpted from somewhere on the ASLA website. In fact, it comes from the forward of Engineering with Nature: An Atlas, a new book by the U.S. Army Corps of Engineers (USACE) Engineering with Nature (EWN) team, led by environmental scientist Dr. Todd Bridges. 

Over the last eight years, Bridges has quietly built the EWN initiative out of the Army Corps’ Vicksburg, Mississippi headquarters, working with a team of engineers, environmental scientists, and ecologists to develop pilot projects that prove the viability of engineering large-scale infrastructure in partnership with natural systems. 

Now, after successfully completing dozens of projects across the U.S., Bridges is pushing to take EWN to new heights. The initiative’s 2018-2023 strategic plan envisions an expanded portfolio of engineering strategies and project types, deeper interdisciplinary and community engagement, and heightened public awareness of EWN goals, activities, and success stories.

To that end, Engineering With Nature: An Atlas documents more than 50 engineering projects completed in recent decades that exemplify the EWN approach. The projects are grouped according to typology, including chapters on beaches, wetlands, islands, reefs, and rivers. Reflecting the collaborative approach of the EWN initiative, only half of the case studies profiled were carried out by the Army Corps. The remainder were executed by partner NGOs in the US and government agencies in England, The Netherlands, and New Zealand, countries which have made substantial investments of their own in innovative coastal and water-based engineering.

Sand_motor
The Sand Motor, The Netherlands / Zandmotor Flickr

A key theme of the book is the beneficial re-use of dredged material. While conventionally viewed as a waste product, the EWN initiative seeks to find and develop beneficial uses for the material, such as in wetland restoration, habitat creation, and beach nourishment. And because the Corps is required to maintain the navigability of all federal waterways, the EWN team has a ready supply of dredged material to work with.

One example of this strategy can be seen in Texas’ Galveston Bay, where the Corps partnered with Houston Audubon to create the 6-acre Evia Island, which today is populated with herons, egrets, terns, and brown pelicans. 

Evia_island
Evia Island / U.S. Army Corps of Engineers

Other projects take advantage of erosion and sediment flux to catalyze beneficial outcomes. In Louisiana’s Atchafalaya River, the Corps placed dredged material in strategic upriver locations to create a 35-hectare island that is “self-designed” by the river’s flow. And at Sears Point, in the northern San Francisco Bay, the Sonomoa Land Trust and Ducks Unlimited restored 1,000 acres of tidal marsh by puncturing a levee, allowing water from the Tolay Creek to flow into a field of constructed sediment mounds. The mounds slowed the water’s rate of flow, stimulating land growth within the project area.

dredge
Dredging in the Atchafalaya River / U.S. Army Corps of Engineers

These approaches have considerable overlap with recent research in the field of landscape architecture, particularly the work of the Dredge Research Collaborative, which advocates for ecological and watershed-scale approaches to the management of sediment and dredged material and has collaborated with the EWN initiative in recent years.

An Atlas also includes projects that retrofit conventional infrastructure to provide ecological benefits, such as creating nesting habitat for terns on top of breakwaters in Lake Erie, or efforts in the Netherlands to redesign coastal reinforcements to serve as habitat for marine plants and animals. Reminiscent of SCAPE’s Living Breakwaters project off the southern coast of Staten Island, these projects demonstrate an increasing interest in designing infrastructure that provides multiple benefits.

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Decoy terns at the Ashtabula Harbor Breakwater Tern Nesting Habitat / U.S. Army Corps of Engineers

Despite its title, At Atlas does not contain any maps or diagrams to orient the reader–an unfortunate omission that makes it difficult to grasp the scale of the presented projects. Instead, the projects are depicted using solely perspective and aerial photos.

While these photos are informative, the book would have greatly benefited from the development of a graphic language to more clearly and visually communicate the impacts of the presented projects and the issues they seek to address.

Despite these omissions, the breadth and scope of projects presented in Engineering with Nature: An Atlas makes a considerable impression, presenting a range of strategies for designing infrastructure with ecological, social, and cultural benefits at multiple scales.

Perhaps most significantly, An Atlas suggests there is great potential for meaningful interdisciplinary collaboration between the Corps and landscape architects. As landscape architects increasingly seek to broaden the field’s scope to include the planning and design of large-scale systems and ecologies, this collaboration may prove vital. Engineering with Nature: An Atlas begins to paint a picture of what such a collaborative practice may look like.

Learn more about the Engineering with Nature initiative and download Engineering With Nature: An Atlas.

A Model Plan for Protecting Vital Coastal Habitats

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Conserving California’s Coastal Habitats / The Nature Conservancy

Sea level rise is coming, and its impacts will be far reaching. For the state of California, the threat of sea level rise may prove existential. More than two-thirds of its population lives in the states’ 21 coastal counties, which are responsible for 85 percent of the state’s GDP.

However, sea level rise will not just impact human activity. Rising tides will also drastically alter, and in some cases destroy, important coastal habitats. Conserving California’s Coastal Habitats, a new report from The Nature Conservancy, provides a startling analysis of the future of California’s coast and charts a path forward for coastal conservation efforts.

The California coast represents the most biodiverse region in the country’s most biodiverse state, lending nationwide significance to coastal conservation efforts there. “The state of California has been a leader in environmental policy for over a century,” say the report’s authors, praising the state’s “legacy of coastal conservation.”

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California’s coastline / Sue Pollock, The Nature Conservancy

However, current policy and decision-making frameworks have been “developed to reflect static existing conditions and are not well suited for the dynamic needs of adapting to sea level rise,” the authors warn.

At risk are “nesting areas along global migrations for diversity of species, as well as nesting and pupping habitat, nursery habitat, and important feeding grounds critical to populations of many species, some which are found nowhere else in the world.”

Sea level rise threatens areas of human settlement and activity, too. The conversion of land to tidal and subtidal coastline will reduce the size of natural buffers, providing less protection to human settlements in coastal flooding events. Saltwater intrusion will impact agriculture. According to the Conservancy, sea level rise and the flooding this will cause could damage or destroy nearly $100 billion worth of property along the California coast by 2100.

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Coastal infrastructure is at risk from sea level rise / Thomas Dunklin

The report’s authors used GIS to identify and map the coastal habitats, ecosystems, and infrastructure most at risk from sea level rise. They based their projections on two and five feet of sea level rise, which they say are in keeping with projections issued by the California Coastal Commission. The authors then developed metrics to measure the potential impact of sea level rise on a given area and the area’s vulnerability and ability to adapt.

Their findings are worrying. “As much as 25 percent of the existing public conservation lands within the analytic zone will be lost to subtidal waters,” they warn. Habitats for eight imperiled species will be completely inundated. Large portions of other significant coastal habitats are “highly vulnerable,” including 58 percent of rocky intertidal habitats, 60 percent of upper beaches, and 58 percent of regularly-flooded estuarine marshes. “At least half of the documented haul-outs for Pacific harbor seals and Northern elephant seals, and nesting habitats for focal shorebirds like black oystercatchers, are also highly vulnerable.”

Maps show that habitats in the San Francisco Bay Area are particularly at risk. There, vulnerable landscapes and habitats–such as 87 percent of the state’s regularly-flooded estuarine marsh–will be trapped between rising seas on one side and human development on the other. “The built environment–including roads and other infrastructure–creates barriers that prevent coastal habitats from moving inland,” while “dikes, levees, and other water control features negatively impact the health and function” of these threatened landscapes.

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California Coastal Conservation Assessment / The Nature Conservancy

The Conservancy finds that sea level rise could adversely affect public access to California’s coast. “Sea level rise will diminish coastal access opportunities throughout the state by reducing beach widths, submerging rocky intertidal areas, and flooding coastal beach infrastructure.”

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Sea level rise threatens access to California’s beaches and coastal public lands / Sylvia Busby

In the face of these potentially-devastating impacts, the report presents a suite of strategies for conservation in the era of climate change. Habitat managers need to “conserve and manage for resilience.” This includes maintaining the conservation status of existing conserved lands and identifying and protecting resilient coastal landscapes that are not vulnerable to sea level rise.

The Nature Conservancy recommends managing for resilience through the use of sediment augmentation and sand placement. “The majority of highly vulnerable conservation lands in need of managing in place for resilience are found in the San Francisco Bay Delta,” an observation that speaks to the importance of landscape-led initiatives such as the recent Resilient by Design Bay Area Challenge.

The Conservancy also calls for conserving nearly 200 square kilometers of potential future habitat areas and adapting the built environment “with more natural coastal processes in mind” – in effect, giving the coastline room to change.

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California’s coastline / Taylor Samuelson, California State Coastal Conservancy

“As sea levels rise, California’s coast will erode and evolve, and habitats will need to shift. Our current conservation efforts and land use management decisions must focus on further supporting these natural processes and enabling the transition and movement of coastal habitats as sea levels rise. Conservation in the face of sea level rise requires an adaptive process that embraces the reality of a dynamic coastline.”

The reports’ recommendations and strategies are “spatially explicit,” with specific proposals for areas, depending on their vulnerability and adaptive capacity. There are detailed high-resolution maps that illustrate the location, distribution, and severity of risks as well as opportunities.

“The results of this spatially explicit assessment provide a foundation of information to support immediate action to conserve habitats and biodiversity in the face of sea level rise,” the Conservancy argues. “With so much of California’s coastal habitats, imperiled species, and managed lands at risk from sea level rise, immediate collective action is necessary to conserve these natural resources into the future.”

Download the full report and maps.

Resilient Design for Low-Income Communities

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Resilience for All / Island Press

In her new book Resilience for All: Striving for Equity through Community-Driven Design, author Barbara Brown Wilson seeks to confront the failings of traditional planning and design practices in vulnerable low-income communities. While others have pursued landscape-based solutions to this issue — think community gardens — Brown suggests there is a larger role for landscape architecture and urban design in resilient, equitable community development.

The communities featured in Resilience for All struggle with many of the same afflictions: environmental injustice, neglect, and lack of resources. These are vulnerable communities that face high exposure to economic and environmental shocks and disinvestment. Landscape and urban design improvements are relatively cheap, widely-accessible method of addressing these issues. Green infrastructure and streetscape improvements figure prominently in the book’s many case studies.

Importantly, Brown believes there is a fundamental relationship between social and ecological systems that, when leveraged, benefit both communities and their environments.

Consider the case of Cully, a low-income, ethnically diverse neighborhood in Portland, Oregon, that suffers from flooding streets, a lack of sidewalks, and languishing parks. Gentrification is also making its inroads.

Ordinarily, progress on the infrastructure front might invite gentrification. But a neighborhood coalition of community members and non-profits has made a point of linking infrastructure goals with wealth-building and anti-displacement goals. This means new parks associated with new affordable housing, construction on these projects performed by community members, and training provided by community organizations. This holistic approach has led to notable successes by Cully’s residents.

As Brown writes, green infrastructure improvements provide economic and health benefits. It’s logical to ensure those benefits serve communities directly and in as many ways as possible. Brown calls this approach “green infrastructure as antipoverty strategy.”

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Cully residents at work in the community garden / Barbara Brown Wilson

Resilience for All shows community development progress comes in phases, with one success usually priming the next.

In the neighborhood of Denby in Detroit, the local high school worked with non-profits to introduce urban planning and city improvements into the senior class curriculum. Students, concerned with local crime, initially set their sights on getting a nearby abandoned apartment building torn down. They aggregated resident organizations into the Denby Neighborhood Alliance and adopted a vision to target blight on a larger scale. They and thousands of volunteers combined efforts to board up vacant homes and reduce blight on more than 300 city blocks and used this cleanup effort to install wayfinding artwork and planter boxes to mark new safe routes to Skinner Playfield, their revitalized school playground.

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“Safe Routes to School” planter box at Skinner Playfield. / Barbara Brown Wilson

Landscape improvements did not come to these communities without considerable effort and without help from a network of friendly actors. And the projects often operate on a humble scale.

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Skinner Playfield network map. This diagram shows the variety of organizations Denby high school students worked with to achieve their desired outcomes. / Barbara Brown Wilson

Each case in Resilience for All represents innovation and progress for the communities and is fleshed out by a mix of empirical research and Brown’s own analysis to paint a picture of what worked, what didn’t, and how those lessons might be absorbed and applied elsewhere. Resilience for All is also bookended by two useful sections: a brief history of community-driven design and an encapsulation of the case studies’ lessons.

Resilience for All is a useful handbook for landscape architect’s wondering how their skill sets might apply to community-led planning and design. It demonstrates how landscape can be a powerful resource for vulnerable communities. And it also shows how communities can positively impact landscapes.

To Limit Global Warming, We Must Transform the Planet

Permafrost thaw ponds on peatland in Hudson Bay, Canada / Flickr

To limit planetary warming to 1.5° Celsius (C), we need to undertake an immediate, multi-trillion-dollar transformation of global energy, land-use, food production, transportation, and urban systems, stated the Intergovernmental Panel on Climate Change (IPCC) in a new report that aggregates the findings of thousands of scientific studies. Humanity can only put a maximum of 420 more gigatons of greenhouse gas emissions into the atmosphere if we want a good chance of only increasing temperatures by 1.5° C (2.7° Fahrenheit), instead of 2° C (3.6° Fahrenheit). At the current pace, our remaining carbon budget will be used up by 2030. The transformation that has already begun in many parts of the world must accelerate and scale across the globe.

To date, global temperatures have increased 1° C (1.8° F) above pre-industrial levels. The IPCC argues that limiting warming to just another half a degree Celsius will still have terrible global impacts, but stave off some of the worst effects and make a major difference for several hundred million people.

Achieving the 1.5° C limit can only happen in the very near term. IPCC states if the planet can achieve net-zero emissions in the coming decades that would essentially halt warming. But if emissions reductions instead occur at a much slower pace up until 2100, then planetary feedback loops — like defrosting permafrost perpetuating warming trends — would make halting warming at 1.5° C impossible.

There are significant differences between 1.5° C and 2° C increases. A 1.5° C temperature increase would mean about 4 inches less of sea level rise by 2100, and at a much slower rate of rise. This would buy time to help the hundreds of million of people who live on coasts and deltas to adapt their infrastructure with resilient natural systems that can also restore and bolster important coastal habitats.

With a 1.5° C increase, some 6 percent of insects, 8 percent of plants, and 4 percent of vertebrates are projected to “lose over half of the climatically-determined geographic range” — meaning their habitat will disappear. While this is awful, the scenario at 2° C increase is far worse: 18 percent of insects, 16 percent of plants, and 8 percent of vertebrates. Impacts from forest fires and invasive species would also be commensurably more at 2° C.

The chance of an ice-free Arctic Ocean during summer is far less with a 1.5° C scenario. But coral reefs face a dire future under both 1.5° C and 2° C scenarios: either a 70-90 percent loss with 1.5° C or near-total extinction with 2° C.

Climate change is also expected to have major impacts on food production, resulting in reduced yields and less nutritious crops. Limiting warming to just 1.5° C would result in “smaller reductions in yields of maize, rice, wheat, and other cereal crops, particularly in Sub-Saharan Africa, Southeast Asia, and Center and South America.” The report authors are also semi-confident that limiting warming to 1.5° C would also reduce the populations affected by water shortages by 50 percent. Still, millions of people would be impacted.

The IPCC report outlines potential pathways to zero carbon. Essentially, greenhouse gas emissions must drop by 45 percent by 2030 and 100 percent by 2050. This would require “rapid and far-reaching transitions in energy, land, urban, and infrastructure (including transport and buildings), and industrial systems.”

IPCC admit that the changes are unprecedented in terms of scale — but not speed. Previous economic and social transformations have occurred with a few years; think of the US economic transformation during World War II or the appearance of smartphone apps in 2007 and their widespread application today.

The report estimates the damage of a 1.5° C increase to the global economy to be tens of trillions a year as soon as 2040. To avoid this, major investments must be made. The report calls for investing $2.4 trillion a year on renewable energy through 2035, which would be about 2.5 percent of global GDP annually, while weaning off coal. The planet would also need another 10 million square kilometers in forests, taken back from agricultural land, and a dramatic reduction in emissions from buildings and transportation systems through energy efficiency and smart growth.

A recent analysis conducted as part of Drawdown, a publication that ranks the 80 most effective ways to reduce greenhouse gas emissions, yielded solutions where landscape architects and planners can help accelerate the transformation. These include: afforestation (#15); mass transit (#37); water savings at home (#46); restoring and protecting coastal wetlands (#52); walkable cities (#54); bike infrastructure (#59); and green roofs (#73). There are also some landscape architects involved in siting renewable energy infrastructure, restoring farm land, managing forests and peatlands, which all rank highly.

IPCC is confident this global transformation can occur. If a mix of adaptation and mitigation measures can be “implemented in a participatory and integrated manner,” they can enable a “rapid systemic transition.” Adaptation measures don’t have to be purely defensive — they can also help communities improve, ensuring “food and water security, reducing disaster risks, improving health conditions, maintaining ecosystem services, and reducing poverty and inequality.” Now, the political will is needed to act.

Read about the recommendations of the ASLA Blue Ribbon Panel on Climate Change and Resilience, which span adaptation and mitigation, and explore ASLA’s guides to climate change mitigation and resilient design.

Unity Park Anchors Equitable Development in Greenville

Unity Park / MKSK Studios

New reconciliation parks in the South — like the Gathering Place in Tulsa, Oklahoma, and Red Mountain Park in Birmingham, Alabama — are explicitly designed to bring together previously-segregated communities. But the new Unity Park in Greenville, South Carolina, goes a step further: it will not only bridge communities but also actually merge two once-segregated parks. Meadowbrook Park, which was once white-only, and Mayberry Park, a smaller green space designated for African Americans, will come together in the new 60-acre Unity Park while still maintaining their distinct histories and identities. This inclusive, $40-million green space is expected to open in 2020.

According to Darren Meyer, ASLA, principal at Ohio-based MKSK Studios, an urban design and landscape architecture firm, the park comes out of a broader planning process for the Reedy River Development Area, an area just west of downtown Greenville. The goal for the city is to create more equitable downtown neighborhoods, with the new park at the center.

In an interview, Meyer said the park is only one component of a new “community character plan” for a 350-acre district that includes form-based code, mixed-use developments, affordable housing, and transportation. A ring of new affordable housing will be built around the park, in an attempt to prevent Unity Park from inadvertently becoming a gentrifying force that displaces the existing community.

According to Meyer, the city has increased investment into its affordable housing trust fund, which is also receiving private and philanthropic funds. The first round of affordable housing is now being built while work begins on the underlying park infrastructure.

Unity Park will include a 120-feet-tall observation tower, which will act as a beacon at night; a great lawn; nature and “destination” playgrounds; a gathering space and visitors center; and pedestrian bridge to improve connectivity.

Unity Park observation tower / MKSK Studios
Unity Park great lawn / MKSK Studios
Destination playground / MKSK Studios
Unity Park gathering space / MKSK Studios
Unity Park pedestrian bridge / MKSK Studios

The city brought an inclusive, community-based planning effort that won approval from African American communities along the park. Greenville News reports that “Mary Duckett, head of the traditionally low-income and African-American Southernside neighborhood association….has been satisfied that its voice was heard and that the park will be one that is welcoming for all.”

Meyer said the planning process was viewed as successful because project leaders “put a tremendous amount of effort into cultivating good relationships. They knew that is really the foundation of trust and a key part to inclusive decision-making.”

Unity Park / MKSK Studios

As part of neighborhood planning and outreach, the city brought in a fire truck that kids could play on; a mobile recreation vehicle, with sports play equipment; and hosted a cook-out for 300 community residents. “These were great events designed to build community.”

MKSK also coordinated planning and design community meetings, with the goal of collecting stories, including those about the African American minor league baseball team that plays in Mayberry Park, and incorporating them into an authentic design. That led to a temporary installation — a mosaic of names of baseball players set into steps leading to the baseball field.

Meyer said the park is not just about re-connecting once-segregated parks, but also about re-connecting the community to a lost river ecosystem. Some 2,000-feet of the Reedy River that runs through the park will be taken out of its concrete channel and become a showpiece of ecological restoration. MKSK will significantly widen the riparian corridor and treat the floodplain in the park as an ecological system.

Unity Park view of the wetlands and river / MKSK Studios

MKSK made the case to city leaders that “the health of the river is tied to the health of the community. There is a quantifiable public health benefit to bringing back the river and wetlands. Beyond the ecological uplift, there is also a great educational opportunity.”

Read more about the park in Greenville News.

ASLA Recommendations: Smart Policies for a Changing Climate

Smart Policies for a Changing Climate / ASLA

Climate change is intensifying the negative impacts of standard development practices and is putting people and communities across the United Sates at risk. The American Society of Landscape Architects (ASLA) convened an interdisciplinary Blue Ribbon Panel on Climate Change and Resilience in September 2017, and this week ASLA released a blueprint for helping secure a sustainable and resilient future that summarizes the panel’s work and recommendations.

Smart Policies for a Changing Climate: The Report and Recommendations of the ASLA Blue Ribbon Panel on Climate Change and Resilience found that the U.S. needs a new paradigm for communities that works in tandem with natural systems. It recommends that public policies should:

  • Be incentive based
  • Promote holistic planning and provide multiple benefits
  • Take into account environmental justice, racial and social equity
  • Reflect meaningful community engagement
  • Regularly evaluated and reviewed for unintended consequences
  • Address broader regional issues as well as local and site-specific concerns.

Smart Policies for a Changing Climate also found that:

  • Designing and planning in concert with natural systems promotes resilience, capitalizes on the benefits of natural systems and provides greater long-term return on investment.
  • Key strategies include use of green infrastructure, native plants, urban and suburban tree planting plans, and healthy soil management practices.
  • Compact, walkable, and transit-oriented “smart growth” communities reduce energy use and are climate smart.
  • Special attention must be paid to vulnerable communities in coastal and inland flood plains and underserved and low-income communities.
  • Transportation should be considered critically as not only a connection point between home to work/services, but also as a source of greenhouse gas emissions, and a contributor or detractor to a community’s appearance and function in light of a weather event.
  • Agricultural systems must be addressed because they are being stressed by unsustainable farming practices and farmland is being lost to expanding development and sprawl.

“Our nation, states, counties, and cities are looking for solutions to mitigate the risks from the changing climate and extreme weather events,” said Nancy C. Somerville, Hon. ASLA, ASLA executive vice president and CEO. “With this report, landscape architects and their design and planning colleagues forward public policy recommendations that can make communities safer while taking climate change and existing natural systems into account.”

ASLA released the report at an evening reception and candid discussion yesterday with Somerville, and ASLA Blue Ribbon Panel members Adam Ortiz, director for the Department of the Environment for Prince George’s County, Maryland, and Diane Jones Allen, program director for Landscape Architecture, the College of Architecture, Planning and Public Affairs at the University of Texas at Arlington and principal landscape architect with DesignJones LLC.

We have provided a platform for landscape architects, public officials, and other design and planning professionals to share their views on how to help communities adapt to climate change through smart design policies. Go to https://climate.asla.org.

The Blue Ribbon Panelists included a diverse range of practitioners, experts and stakeholders with different levels of experience working in different aspects of geographic and technical design. They are:

  • Vaughn Rinner, FASLA, SITES AP, ASLA Immediate Past President, Chair;
  • Armando Carbonell, FAICP, Senior Fellow and Chair, Department of Planning and Urban Form, Lincoln Institute of Land Policy;
  • Mark Dawson, FASLA, Managing Principal, Sasaki Associates Inc.;
  • Tim Duggan, ASLA, Founder, Phronesis;
  • Ying-yu Hung, ASLA, Managing Principal, Principal, SWA, Los Angeles Studio;
  • Dr. Dwane Jones, Ph.D., Director of the Center for Sustainable Development + Resilience at the University of the District of Columbia;
  • Diane Jones Allen, ASLA, Program Director for Landscape Architecture, the College of Architecture Planning and Public Affairs at the University of Texas at Arlington and principal landscape architect with DesignJones LLC;
  • Adam Ortiz, Director for the Department of the Environment for Prince George’s County, Maryland;
  • Nancy Somerville, Hon. ASLA, SITES AP, Executive Vice President and CEO, ASLA; and;
  • Dr. Jalonne L. White-Newsome, Ph.D., Senior Program Officer, Environment, The Kresge Foundation.

Some quotes from panelists on the importance of adopting effective public policies and landscape architecture design solutions:

“The plans we’re going to have in the future to deal with living with water have to be more realistic. We have to live with the acknowledgement that there will be hurricanes and areas that naturally want to flood. How do we build differently as opposed to thinking we can keep water out?”

Diane Jones Allen, ASLA
Program Director for Landscape Architecture, the College of Architecture, Planning, and Public Affairs at the University of Texas at Arlington

“We have a number of antiquated policies within governmental structures. Reevaluating them every five years or so would help us to reflect what is currently happening and to better project how we should design communities to be able to proactively respond to such changes and challenges.”

Dr. Dwane Jones, Ph.D.
Director of the Center for Sustainable Development + Resilience at the University of the District of Columbia

“All public projects really have to be interdisciplinary. They have to incorporate the local culture, the local economy, forward-thinking design concepts, as well as good engineering. All that together, in a very thoughtful way that respects the complexity of our society, is a way to make a sustainable project that people enjoy and love.”

Adam Ortiz
Director for the Department of the Environment for Prince George’s County, Maryland

“One of the things we need to be doing is do a lot more experimentation. Sometimes you just need to be able to try things and see if that solution can take you forward. If it’s not a good solution, let’s try something else. That kind of creativity and ideas is really what innovation is all about.”

Vaughn B. Rinner, FASLA, SITES AP
Immediate Past President, American Society of Landscape Architects

“Our standard development practices are not sustainable, but when we understand and work with natural systems, we can build safer and healthier communities.”

Nancy C. Somerville, Hon. ASLA. SITES AP
Executive Vice President and CEO, American Society of Landscape Architects

“My hope is that we embed true kinds of community engagement, justice, and equity into our focus on climate change and resilience. We need to really do that in a way where it’s not so scientific. The social engineering matters as well. It’s what you’re doing in your profession that impacts people and makes those impacts equitable.”

Dr. Jalonne L. White-Newsome, Ph.D.
Senior Program Officer, Environment
The Kresge Foundation

Is This the Future of Designing with Nature?

Responsive Landscapes / Routledge

“The Mississippi River is now an engineered system, so we are responsible for it,” said Bradley Cantrell, ASLA, chair of the landscape architecture department at the University of Virginia, at a lecture hosted by Landscape Architecture Magazine (LAM) at the Center for Landscape Architecture in Washington, D.C. The river has essentially been re-designed to serve as a conduit of goods and to protect human settlements from flooding. As civil engineers control and manipulate ecological systems for human ends, Cantrell argues landscape architects should be at the table. By creating models and simulations that mimic how natural systems function, landscape architects can get a better understanding of ecological complexity and help steer the future design of nature.

Cantrell’s work seems to be inspired as much by Ian McHarg’s influential book Design with Nature as it is by the Mississippi River Basin Model, a 61-acre hydraulic model set within a 200-acre model of the Mississippi River watershed, which was developed from the 1940s to 1960 and in operation until the 1970s near Clinton, Mississippi. Viewing the vast model from watchtowers, visitors could “collectively view and understand the river as a system.” Engineers could also get a better understanding of how the river behaved. They could tweak valves and pipes to re-create real-world fluvial events. This is instance where the “model could serve as a guide.”

Mississippi River Basin Model / Atlas Obscura

At Harvard University Graduate School of Design (GSD), Cantrell created innovative simulations using foam board, plywood, different forms of sand and sediment, and water. Rigging them up with a slew of sensors that measured water flow and sediment accumulation, Cantrell and his students “built physical diagrams that explain how natural fluvial processes occur.” Cantrell was careful to note that “these were only a form of projection, a publicity piece, really. We didn’t build the perfect model of nature. There is no more truth in them than formal models.”

But Cantrell thinks that even with the clear limitations, these models serve an important purpose: “we can let them inform design and generate new systems. Creating simulations is an act of design itself. We are creating an artificial reality that we can learn from, and then we can choose how we apply it to reality — in order to control or interact with the physical world.”

Responsive Landscapes, a book Cantrell co-authored with Justine Holzman and published in 2015, identified what models and simulations can accomplish:

  • Elucidate: “We can bring out features that are beyond human senses. We can create different forms of sensing.”
  • Compress: “We can compress the world around us — not only the physical but also the temporal world.”
  • Shift contexts: “We can displace context, taking experiences and manufacturing them somewhere else.”
  • Connect: “We can create direct connections — worm holes.”
  • Modify: “We can change our relationship with the world.”

Working with graduate students at Harvard GSD, Cantrell created advanced simulations that mimic natural fluvial processes. Some were later turned into point-cloud models and further visualized through software. Loaded with sensors, models had a dashboard that enabled real-time monitoring and interaction.

Fluid modeling table / The Architect’s Newspaper, courtesy Bradley Cantrell

Why do all of this? Cantrell said civil engineers are already creating models and simulations of natural processes, but to be able to participate in the development of these massive, constructed systems for managing nature, landscape architects must have access to the same tools. “To have a conversation with engineers — that’s really the most important part.” Within that conversation, landscape architects can then “be creative and drive new design pathways.”

While Cantrell admitted all of this is in the “speculative and very beginning stages,” and the models he is working with today may be “nascent and naive,” in the near future, models and simulations can be tuned against data collected from sensors in real landscapes, thereby creating a constant feedback loop between model and the real-world.

When that happens, landscape architects can then become more ambitious, engaging with even larger systems. Landscape architects can find new opportunities to design with nature — to harness intrinsic natural processes to direct the flow of water and process of sedimentation and land-forming. “We can use waste streams to create new land. We can use ecological systems to reconstitute the landscape itself. And we can manage the landscape in real-time.”

While all of this is exciting, engineering ecosystems — which are among the most complex systems on Earth — may generate unintended consequences. One can imagine the need for prudence in applying any model or simulation, which are simplification tools, to the real world. In addition, as more of nature becomes less natural and more designed, constructed, and maintained, questions of management and ownership arise. Who will own the designed ecosystems of the future? Who will we decide how they should be used?

New Guide: Ecological Landscapes at Home

Over the four-year construction period, the addition of hundreds of mature trees and countless flowering shrubs, perennials, and groundcovers, brought in a flood of nesting birds and insect pollinators. ASLA 2016 Professional Residential Design Honor Award. Kronish House, Beverly Hills, California / Marmol Radziner.

Plants are central to a functioning global ecosystem. Plants oxygenate the atmosphere and reduce atmospheric pollutants. Ecological restoration in both developed and developing countries is a primary strategy for mitigating the impacts of climate change. Native plant communities are not only key to the global ecosystem, but also crucial to environmental and human health at the residential and neighborhood scales.

Urbanization has fragmented what were ecologically-productive landscapes. According to the Audubon Society, the continental U.S. has lost 150 million acres of wildlife habitat and farmland to urban sprawl over the last century. Sustainable residential landscape architecture practices can help build a network of productive landscapes. Native plants can be used to regenerate sustainable plant communities and reconnect fragmented ecosystems in residential areas. Creating a network of productive ecosystems expands wildlife habitat areas and boosts human health and well-being by bringing nature’s benefits right to residential yards and outdoor spaces.

ASLA has created a new guide to applying ecological design at home, which contains research, projects, and resources on residential landscapes. Developed for homeowners and landscape architects and designers alike, the guide is designed to help spread more sustainable and resilient practices.

Homeowners can use native plants to reduce the use of excess water, energy, and chemical fertilizers and pesticides that damage natural ecosystems, as well as support pollinators.

Residential landscapes can also be used to grow food at home and in communities. When growing food, gardeners should apply principles of ecological design and permacultural practices to ensure food production and garden systems are integrated with the natural environment and avoid contaminating local watersheds with runoff. Homeowners and communities can create composting systems for efficient waste removal and to increase organic matter in the soil.

And plants can also be used inside the home to improve air quality and human productivity.

Homeowners should be mindful of the quality of the soil on their property. Healthy soils are essential to plant and tree health and enable the infiltration of stormwater into the ground. Years of development and construction can lead to layers of compacted soil that restrict movement of water and air, and limit root growth. Homeowners can achieve credit from The Sustainable Sites Initiative™ (SITES®) by using techniques like subsoiling and adding soil amendments to help rebuild ecological function in soils.

Landscape architects partner with communities, non-profit organizations, and local governments to increase public awareness about using sustainable residential design practices that yield productive plant systems and reduce the negative ecological impacts of typical residential development.

Explore sections of the guide:

Native Plants
Ecological Gardens and Permaculture
Supporting Pollinators
Residential Composting
Indoor Plants