The 2012 ranking of America's greenest cities.
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|Despite serious social and economic problems, several cities continue to make progress towards becoming more sustainable.|
|Results for the 2012 Greenest U.S Cities ranking.|
|The Top 10 green mayors of America's largest cities.|
|Can mayor Michael Nutter make sustainability stick in his second term?|
|Portland tops on transit, Austin energy goes green. San Francisco, meanwhile, knows how to take out the trash.|