Stephen Porder is the Associate Provost for Sustainability and the Acacia Professor of Ecology, Evolutionary and Organismal Biology and Environment and Society at Brown University. He is also a fellow in the Institute at Brown for Environment and Society. Porder is cofounder of the radio show and podcast Possibly, which is broadcast on public radio stations around the country and provides practical sustainability advice about everyday decisions. His most recent book is Elemental: How Five Elements Changed Earth’s Past and Will Shape Our Future (Princeton University Press, 2023). Website: www.porderlab.org