San Francisco named 'Greenest city in US'

June 30, 2011 10:18:28 AM PDT
A new survey has named San Francisco as the greenest big city in the United States and Canada.

The survey was commissioned by Siemens, a global healthcare and energy company. It ranked 27 major cities in several areas including energy, transportation and waste.

San Francisco ranked first overall because of strong showings in just about every category, especially in waste, because of mandatory composting and recycling. The survey also praised the city's extensive public transportation system.

The other cities in the top five were Vancouver, New York City, Seattle and Denver.