Our guest today is Bill McKibben, an activist and author at the forefront of the movement to address the climate crisis, even as far back as 1989, in his book “The End of Nature.” A legendary leader in the environmental movement, he’s the founder of 350.org, the first global climate change campaign, and Third Act, a group that mobilizes people over the age of 60 for action on climate and justice.  On September 15, 2025, McKibben came to the Sydney Goldstein Theater in San Francisco to talk to journalist and author Lauren Markham, about his new book, Here Comes the Sun. In it, McKibben offers solar solutions to some of the biggest impacts of climate change.