As climate summit continues, fed-up mayors unveil actual plans They cover 1 percent of the Earth's surface, but the world's cities spew 80 percent of greenhouse-gas emissions -- and 180 percent of climate-action plans. "Where national governments can't or won't lead, cities will," said Toronto Mayor David Miller at the C40 Large Cities Climate Summit in New York City. Yesterday, Miller unveiled an online social-networking carbon calculator called Zerofootprint Toronto that will, he says, "help make my city not only one of the greenest on the planet, but one of the most innovative as well." He's not alone: Los Angeles …
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