Gwynne Dyer is a British writer known for his environmental and political activism. He writes a regular column for The Guardian and is the author of a number of books.

Bill McKibbon is an American environmentalist, author, and journalist who has written extensively on the impact of global warming. He is the Schumann Distinguished Scholar at Middlebury College^[2] and leader of the climate campaign group 350.org. He has authored a dozen books about the environment, including his first, The End of Nature (1989), about climate change, and Falter: Has the Human Game Begun to Play Itself Out? (2019), about the state of the environmental challenges facing humanity and future prospects.