Mountainfilm 2009 and 2011 guest Bill McKibben has become one of the leading environmental writers and activists, organizing the recent Keystone XL protest at the White House. He recently published an op-ed in The Washington Post about the connection between climate change and extreme weather events. Now filmmaker Stephen Thomson has combined McKibben's words with striking footage of the events he writes about. The result is powerful.

Tornadoes, fires, floods, crop failures—they’re all isolated events, right? This powerful video from Bill McKibben and Stephen Thomson helps connect the dots of the climate catastrophe.