Rivers are one of nature s most vital energy sources, and their power can be efficiently harnessed through the construction of dams. But now dams have become a controversial engine in the race toward technological advancement, so much so that the World Commission on Dams convened in 1998 to debate the issue. Are dams a help to society or an agent of environmental destruction? Trevor Turpin explores the answers to that question here in his comprehensive historical chronicle.

Among the most amazing feats of human engineering, a dam can sustain societies in a multitude of ways, as40,000...