Bill McKibben is the founder of climate change campaign 350.org. If you’ve read The Great Healing you know that ‘350’ refers to the atmospheric carbon dioxide level in parts per million, a threshold that if exceeded, would end Earth’s climate stability. The higher the level above 350ppm the more severe the consequences of global warming will be. We blew past that threshold around 1950. Today we have reached 419ppm.
Bill is an engaging writer. His most recent book is Falter: Has the Human Game Begun to Play Itself Out.