Popular Science developed a ranking system for American cities, based on U.S. Census Bureau data and the National Geographic Society’s Green Guide. The ranking statistics draw from over 30 categories and are compiled into four categories: electricity, transportation, green living, and recycling and green perspective. Portland, OR ranked the highest out of the 50 greenest cities. Check out the full list at: http://www.popsci.com/environment/article/2008-02/americas-50-greenest-cities?page=1
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