Learning from Past Civilizations

As wells go dry, as grasslands are converted into desert, as fisheries are depleted, and as soils erode, people are forced to migrate elsewhere, either within their country or across national boundaries. As the earth’s natural capacities at the local level are exceeded, the declining economic possibilities generate a flow of environmental refugees.

Adapted from Chapter 1, “Entering a New World,” in Lester R. Brown, Plan B 3.0: Mobilizing to Save Civilization (New York: W.W. Norton & Company, 2008), available for free downloading and purchase at www.earthpolicy.org/Books/PB3/index.htm.