The irrepressible Bill McKibben, and the movement he founded - 350.org - have been behind two of the biggest climate change victories in recent years: the blocking of the Keystone XL pipeline and the withdrawal of 3.4 trillion dollars of fossil fuel investments. He talks to JOE WARE
Thanks to the Web and social media, environmentalism has become a worldwide movement. Ben Whitford reports on the need now to take bigger risks and have even bigger confrontations