Oran Viriyincy 2. Greg Nickels, Seattle.
In some ways, Greg Nickels became synonymous with the phrase “green mayor” after spearheading the U.S. Mayors Climate Protection Agreement in 2005. Since then, more than 900 of Nickels’ fellow mayors have come on board, Republican and Democrat alike, from all 50 states. No stranger to eco-ideas at home, Nickels — who has led the Emerald City since 2002 — has also been instrumental in bringing light rail to the area, pushing to increase investments in open space, and launching an ongoing series of “clean and green” community-service events. He’s up for reelection this year, and one challenger says he hasn’t done enough on the environment. Only in Seattle.