Author and 350.org founder Bill McKibben traced his path from writing The End of Nature at 27 to concluding that climate change was not an argument but a fight over money and power, and recounted founding 350.org with seven college students, the 2009 global day of action, Keystone XL resistance, Standing Rock and the fossil fuel divestment campaign. He stressed that the least responsible communities suffer first, citing Bangladesh, Puerto Rico, Flint and local coal ash fights. A Q&A followed.