National Geographic: oday on CNN.com and CNN International, C40 Chair, New York City Mayor Michael R. Bloomberg is featured in both an op-ed and broadcast interview discussing how cities, on the frontlines of the fight against climate change, are leading the charge in addressing this critical issue. Says Mayor Bloomberg: Around the world, city leaders are not wasting time debating the science of climate change or waiting around for international treaties to be signed; we are taking action. Theres simply too much...