Jonathan Foley, head of the University of Wisconsin’s Center for Sustainability and the Global Environment, or SAGE, cites the launch of Earth Day in 1970 as the original catalyst. But until recently, he says, “we’ve had an artificial separation” between the study of the natural environment and our human impact on it. Sustainability studies views the two as an inextricably connected whole. It addresses predicaments whose impact can be felt both locally (Greenland’s melting ice field, in one well-known example) and globally (the resulting potential for rising water levels and changing ocean currents).
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