New York City Mayor Michael Bloomberg is seeking to change term-limit rules and win reelection to a third term; if he succeeds, it will be to the benefit of his ambitious plans to address climate change. Bloomberg’s PlaNYC aims to reduce municipal greenhouse-gas emissions 30 percent by 2030 through planting 1 million trees, converting taxis to hybrids, and making buildings more energy efficient. In other mayor news, a study commissioned by the U.S. Conference of Mayors suggests that 4.2 million green jobs could be created over the next 30 years, up from 750,000 or so now. “It could be the fastest growing segment of the United States economy over the next several decades,” says the report by Global Insight, Inc. Of course, the report assumes that by 2038, alternative energy will be widespread, buildings will be much more efficient, vehicles will run on alternative fuel, and Michael Bloomberg will be NYC’s mayor. Oh wait, not that last one.