Bill McKibben is a journalist and activist who founded the environmental organisation 350.org. The author of fifteen books, including the bestsellers The End of Nature, Eaarth and Deep Economy, he is the Schumann Distinguished Scholar in Environmental Studies at Middlebury College and the winner of the Gandhi Prize, the Thomas Merton Prize and the Right Livelihood Prize. He lives in Vermont.

Jaime Green, series editor, is a freelance writer and editor. She is the associate editor of Future Tense, a partnership of Slate, New America, and Arizona State University.

Her first book, about how we imagine alien life in science and in fiction, will be published in 2023., Dr. Ayana Elizabeth Johnson is a marine biologist, policy expert, writer, and Brooklyn native. She is co-founder of the non-profit think tank Urban Ocean Lab, co-founder of the climate initiative The All We Can Save Project, and co-creator of the podcast How to Save a Planet.