Editor’s note: The chat’s now over, but you can replay it in full.

Readers joined Grist founder Chip Giller for a live chat with Bill McKibben, environmental activist and author of The End of Nature and Eaarth: Making a Life on a Tough New Planet. They asked McKibben about the latest news on climate science and climate politics, the need for direct action in the climate movement, and 350.org’s big plans for a Global Work Party on 10/10/10.