Partha Dasgupta is the Frank Ramsey Emeritus Professor of Economics at the University of Cambridge, Chair of the Centre for the Study of Existential Risk, University of Cambridge, and a Fellow of St John's College, Cambridge. He was knighted in 2002 for his services to economics, and is a Fellow of the Royal Society, Foreign Associate of the National Academy of Sciences, and Member of the Pontifical Academy of Social Sciences. He won the Volvo Environment Prize in 2002, the Blue Planet Prize in 2015 and the Tyler Prize in 2016. Peter Raven is the President Emeritus of Missouri Botanical Garden and the George Engelmann Professor of Botany Emeritus at Washington University, St Louis. He is a Member of the National Academy of Sciences, Foreign Member of the Royal Society, and Member of the Pontifical Academy of Sciences. He won the Volvo Environment Prize in 1992, the International Cosmos Prize in 2003, and the National Geographic Society's Hubbard Medal in 2018. Anna McIvor completed her Ph.D. in the Department of Zoology, University of Cambridge, and has since worked as a post-doctoral research associate in the Departments of Zoology and Geography at the University of Cambridge.