In addition to having the filthiest streets in the nation, San Francisco has just been anointed the greenest city in the United States and Canada, according to a study by Siemens. The report assessed and compared "27 major U.S. and Canadian cities on environmental performance and policies across nine categories - CO2 emissions, energy, land use, buildings, transport, water, waste, air quality and environmental governance."

“It’s certainly an honor for San Francisco to be named the ‘greenest’ city in North America, and it’s great to get recognition for the good work San Franciscans have done,” said Mayor Lee. “San Francisco is committed to working toward a greener, healthier future for the City, and I think there’s nowhere else on earth where you will find more environmentally involved residents, businesses and visitors than in San Francisco.”

This is great news, obviously. Seeing as how most of us are now forced to recycle and compost (and with good reason!), San Francisco absolutely deserves the honor. It's been a lot of hard work.

San Francisco scored 83.8 out of 100. Other cities trailing behind? Vancouver, New York City, Seattle, and Denver complete the Top 5. Landing with a resounding thud in the Top Bottom are Pittsburgh, Phoenix, Cleveland, St Louis, and much to no one's surprise, Detroit.