Agence France-Presse: Leaders of the world’s biggest cities called for a bigger say in upcoming UN climate change talks as they wrapped up a three-day summit on ways to combat global warming. “The fight against greenhouse gas emissions will be won or lost in cities,” said Toronto Mayor David Miller, chair of the C40 Large Cities Climate Summit in the South Korean capital. The leaders in a summit declaration stressed that half the world’s population lives in cities, which account for 75 percent of …