Top 10 green U.S. cities

Although the EPA has not established official criteria for ranking the greenness of a city, there are several key areas to measure for effectiveness in carbon footprint reduction. These include air and water quality, efficient recycling and management of waste, percentage of LEED-certified buildings, acres of land devoted to greenspace, use of renewable energy sources, and easy access to products and services that make green lifestyle choices (organic products, buying local, clean transportation methods) easy. MNN's editorial team rounded up our top 10. — Text by Angela Black