Mobilizing the Region: "The panel conclusively shows that warming since the 1950s — when suburban development and transportation policy became much more auto-centric — has been unprecedented. In the United States, the automobile’s greenhouse gas emissions is the second-largest contributor to global warming from the transportation sector, which as a whole accounts for 28 percent of total U.S. GHG emissions. Car emissions are also the fastest growing source of U.S. GHG, with a 48 percent net increase in total emissions since 1990. And, transportation is the largest end-source of CO2 emissions, the most prevalent of greenhouse gases."
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