“In all, by the end of the twentieth century mankind had built some 45,000 large dams; during the global peak of dam building in the 1960s, 1970s, and 1980s, some 13 were being erected on average every day. World reservoir capacity quadrupled between 1960 and 2000, so that some three to six times more water than existed in all rivers was stored behind giant dams. World hydropower output doubled, food production multiplied two and half times, and overall economic production grew sixfold.”