Bill McKibben, environmentalist, author and scholar in residence at Middlebury College, is the author of many books including "The End of Nature" (the first book for a general audience about climate change) and most recently "Deep Economy: The Wealth of Communities and the Durable Future," a critique of economic growth and call for a transition to more local-scale enterprise. He founded stepitup07.org, which organized rallies in hundreds of American cities and towns to demand that Congress enact curbs on carbon emissions.