

SUBURBANIZATION AS GLOBAL DEFAULT
Two main challenges of framing critical discussions about suburbia are its diversity and its ubiquity. America’s urban fringes include gridded streetcar suburbs, meandering golf-course subdivisions, trailer and RV parks, industrial estates, and “ethnoburbs.” Whatever form suburbia may take, it has become the American default, with more than half of the country’s population residing there. In other parts of the world, too, urbanization is now mostly suburbanization; the outskirts of cities like Beijing and Istanbul are undergoing tremendous growth. Stepping back to find a critical vantage point on this terrain isn’t easy. The “Future of Suburbia” conference started with a keynote speech by Robert Bruegmann, a professor emeritus of art history, architecture, and urban planning at the University of Illinois at Chicago, and wrapped up a day later after four wide-ranging panels. Attendees learned about new garden suburbs that will be grafted onto existing cities in the U.K.; a “ghost suburb” for testing new technologies in the Southwestern desert; and how the executives of North Carolina’s Research Triangle Park are reimagining its normative office campuses.



REFORMERS VS. VALIDATORS
A quick detour for context: Among the few designers who focus on the suburbs today, most fall into a camp that I’ll call the Reformers. Led by the New Urbanists, this group believes that suburban development seriously imperils the climate, and that typical suburban living patterns are bad for public health, community spirit, and individual well-being. You can probably guess what the solution is: Make suburbs more like cities. Suburban Nation, by Andrés Duany, FAIA, Elizabeth Plater-Zyberk, FAIA, and Jeff Speck (North Point Press, 2001), is a manifesto in this mold, while Retrofitting Suburbia (Wiley, 2011), by Ellen Dunham-Jones and June Williamson, gathers practical case studies of sprawling zones that, like caterpillars into butterflies, have morphed into urban districts. MIT’s CAU, on the other hand, seems to be rallying its own troops around a very different agenda. Let’s call them the Validators. They believe that suburbia is fundamentally OK. They maintain that when people have options, they will usually choose to live in a single-family home in the suburbs, and for intellectuals to resist this is classist and perverse. Validators point out (correctly) that the much-hyped urban revival we keep reading about is mostly limited to affluent white Gen Xers and Millennials. At the conference, economist Jed Kolko analyzed recent census data to show that on the whole, America continues to suburbanize.


SUBURBIA AND CLIMATE CHANGE
But this framework resulted in one major and (presumably) deliberate omission that was harder to accept. The environmental impact of suburban land use, particularly its role in climate change, was simply waved away. Bruegmann cited Australian findings that greenhouse-gas emissions per capita are higher downtown than on a city’s outskirts, while Berger argued that high density doesn’t solve environmental problems. End of story. The notion that compact urban areas are better for the climate is subject to debate. In support of it, though, is a decent body of research, including a 2010 paper in the Journal of Urban Economics finding that cities “generally have significantly lower emissions than suburban areas,” as well as data showing that denser cities have lower emissions per capita than spread-out ones. Bruegmann ascribes this to affluence, not land use: People in dense developing-world cities like Mumbai consume less, and therefore use less energy. But plenty of affluent cities, like London and Paris, also have relatively low per-capita emissions. These tend to be cities where people inhabit smaller homes and drive less. A 2014 University of California, Berkeley study found that urban density doesn’t translate directly to low carbon emissions, but the three main drivers of carbon footprints are household income, vehicle ownership, and home size, “all of which are considerably higher in suburbs.” If so, then better planning and design in suburbia could move the needle on two out of three variables to help mitigate climate change. That would be a huge opportunity (many would say an obligation). So why discount it? Surely one can be pro-suburb while recognizing the benefits of living smaller and driving less.






