Brattleboro Reformer: The citizens of the world may not get a better chance to reverse the mounting threat of global warming, even in the face of a struggling economy. That’s the message environmentalist and author Bill McKibben preached to a Brattleboro crowd during a town meeting event Sunday afternoon. McKibben said the United States, as well as the rest of the world, is facing huge financial issues and equally huge environmental issues, but there remains a very narrow window for a gradual …