The realization that individual action has little to no impact on major environmental problems — to say nothing of the existential threat of climate change — can prompt despair, 1995 Fellow Paul Steinberg, a professor of political science and environmental policy at Harvey Mudd College, says. But it doesn’t have to. We could try, instead, consulting social scientists, who have spent a lot of time thinking about just this problem: How can a single individual can act in a way that effects large-scale change?