Bill McKibben offers his perspectives on climate change, including the critical underestimation that scientists made during the past 30 years, the best way for individuals to make a difference, and the one fact about our climate that you need to know—to understand our century. McKibben is the founder of 350.org, the first global grassroots climate change movement. His 1989 book The End of Nature is regarded as one of the first written for a general audience on the realities of climate change.