Professional Practice

Climate Change Mitigation: Regional Solutions

Nearly half of global greenhouse gas (GHG) emissions are related to the landscape and built environment.

Regional sprawl is a big part of the problem. The average Atlanta-area resident produces more than ten times as many carbon dioxide emissions from transportation than the average resident of Barcelona, Spain, even though both cities have the same population. The difference is a result of the built environment: Barcelona takes up just 162 square kilometers (km2), less than 4 percent of Atlanta’s 4,280 km2. In all, America’s sprawling, car-centric suburbs are responsible for 50 percent of all U.S. GHG emissions. Sprawl is also more expensive than compact development, costing the US economy more than $1 trillion dollars every year

For these reasons, reducing regional sprawl is key to reducing overall GHG emissions. According to the National Renewable Energy Laboratory, smart growth policies and increased use of public transit could help US cities reduce emissions by anywhere from 7-19 percent annually by 2035.

Landscape architects play a key role in achieving this goal. Landscape architects plan and design transit oriented development (TOD), which reduces sprawl and allows people to live a less car-dependent lifestyle. They create regional plans that promote walking, cycling, and the use of public transit. They design towns, parks, plazas, and streets with seamless, interconnected access to multiple low-carbon transit options. They create access to local transit, which connects to airports, bus, and rail stations, allowing residents to travel long distances without needing a car.

All of these efforts also enable communities to better adapt to the impacts of climate change already being felt. Low-carbon regions with lots of transportation options are by nature more resilient -- there are more ways to move if one mode fails in the event of a natural or man-made disaster. 

Organizations

American Planning Association

American Public Transportation Association

Congress for New Urbanism

Smart Growth America

Resources

Fast Facts on Transportation Greenhouse Gas Emissions, U.S. Environmental Protection Agency

Public Transportation's Contribution to U.S. Greenhouse Gas Reduction, American Public Transportation Association, 2007

Smart Growth and Climate Change, U.S. Environmental Protection Agency

Transportation Design Guide, American Society of Landscape Architects

Research

Density, Carbon Emissions, Transportation and Energy Efficiency, Dana Flatow, University of Texas at Austin School of Architecture

Estimating the National Carbon Abatement Potential of City Policies: A Data-Driven Approach, Eric O'Shaughnessy, Jenny Heeter, David Keysery, Pieter Gagnon, and Alexandra Aznar, National Renewable Energy Laboratory

Getting to Minus 80: Defining the Contribution of Urban Form to Achieving Greenhouse Gas Emission Reduction Targets, The Design Center for Sustainability at The University of British Columbia, Vancouver, Canada

Suburban sprawl cancels carbon-footprint savings of dense urban cores, Robert Sanders, Berkeley News, January 6, 2014

Urban Density and Climate Change, David Dodman, United Nations Population Fund, April 2, 2009

Projects

Atlanta Beltline Redevelopment Plan, Atlanta, GA
EDAW, Inc.

The Fourth Regional Plan, New York, NY
RPA

Great Lakes Century Vision
Skidmore, Owings & Merrill LLP

Positioning Pullman, Chicago, IL
site

Regional Climate Action Plan
Southeast Florida Regional Climate Change Compact

Urban Corridor Planning, Houston, TX
The Planning Partnership Limited


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