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Bill McKibben is known here and abroad as one of America's most passionate and effective environmental activists. In 1989, his book The End of Nature first alerted Americans to the climate crisis. And back then, he still had faith in his country to do right—not just environmentally, but for racial and economic justice. He was a faithful, optimistic Christian in an era where everything seemed on the right track. Now he wonders— as the subtitle of his new book The Flag, the Cross, and the Station Wagon asks—"What the hell happened?"

Bill McKibben is the co-founder of the global climate group 350.org, which has organized protests on every continent; the founder of Third Act, to build a progressive organizing movement for people over the age of 60; he is the author of over a dozen books; and the winner of the Gandhi Peace Prize. He spearheaded efforts against the Keystone Pipeline, and for fossil fuel divestment. Now the man who's taught us so much about battling for the environment has turned the conversation intensely personal.

Join us as Bill McKibben sits down with Kepler's journalist-in-residence Angie Coiro to discuss his new memoir, his old optimism, and why he still sees light on the horizon.