What Are the Greenest Cities in the United States?

10. Austin, TX 1 of 11

The city of Austin, Texas has set a goal to be carbon neutral by the year 2020. The city is already well on its way, as Austin Energy is the nation's top seller of renewable energy. Austin also has set aside a lot of space for green areas: 206 parks, 26 greenbelts or undeveloped areas, 12 preserves and 50 miles worth of nature trails.