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The greatest threat to the environment, according to extensive reporting by the Associated Press? The mayor, that's who:

Mayor Michael Bloomberg, who has pushed an ambitious green agenda and cast himself as a national environmental leader, routinely runs afoul of his own anti-pollution policy by letting his official SUVs idle, sometimes for more than an hour. In spot checks over the past week, The Associated Press timed idling periods for the mayor's city-owned SUVs, which shuttle him around the city or trail him when he takes the subway. The parked vehicles idled at least eight times for periods of 10 minutes to over an hour.

At this rate, it won't be long before Manhattan begins to look like this. Do be sure you have your favorite bathing suit ready and waiting. [AP]