By Dan Shapley
As the mayors of the world convened in New York City this week, the resounding theme was that cities, as prolific producers of greenhouse gases, should be the lead the effort to reduce global warming pollution. Not to mention they don't see enough action from their national leaders. New York City Mayor Michael Bloomberg, who along with former President Bill Clinton is hosting the climate summit, is also emerging as a must-hear voice on climate matters. His PlaNYC, and the speeches he's delivered on the comprehensive sustainability plan, have many speculating that he could run for president, or seek some other prominent national or international role, according to a story in the May 16 Newsday.