San Francisco Named North America's Greenest City

San Francisco took the title as the greenest city in North American in a study of the environmental performance and commitments by 27 major metro areas in the U.S. and Canada.

The study, conducted by the Economist Intelligence Unit and commissioned by Siemens, is part of the Green City Index, an ongoing research project that looks at global regions and their major cities. The index, which covers Europe (where Copenhagen topped the list), Asia and Latin America, was expanded to North America and Germany this year.

To claim the top spot in North America, San Francisco bested contenders that included Vancouver, New York, Seattle, Denver and Boston.

The 27 cities examined in the study were ranked based on scores in nine areas -- CO2, energy, land use, buildings, transport, water, waste, air and environmental governance. Thirty-one indicators were evaluated across the nine categories, as shown in the chart at the foot of the page.

Here are the rankings for the cities and their overall scores:

1. San Francisco, 83.8
2. Vancouver, 81.3
3. New York City, 79.2
4. Seattle, 79.1
5. Denver, 73.5
6. Boston, 72.6
7. Los Angeles, 72.5
8. Washington, D.C., 71.4
9. Toronto, 68.4
10. Minneapolis, 67.7
11. Chicago, 66.9
12. Ottawa, 66.8
13. Philadelphia, 66.7
14. Calgary, 64.8
15. Sacramento, 63.7
16. Houston, 62.6
17. Dallas, 62.3
18. Orlando, 61.1
19. Montreal, 59.8
20. Charlotte, 59.0
21. Atlanta, 57.8
22. MIami, 57.3
23. Pittsburgh, 56.6
24. Phoenix, 55.4
25. Cleveland, 39.7
26. St. Louis, 35.1
27. Detroit, 28.4

Here are the areas in which they are evaluated:

Next Page: How San Francisco landed the top spot.