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In this age of big screen special effects, the only disaster we might associate with a dam would revolve around one of them breaking. However, despite the benefits typically assigned to dams, environmentalists are taking a much closer global look at these structures. What they?ve found is alarming. Dams can result in: climate change, destruction of rivers, human displacement, and disappearing salmon.

Jacques Leslie, author of Deep Water: The Epic Struggle over Dams, Displaced People, and the Environment, points out: "The world's dams have shifted so much weight that geophysicists believe they have slightly altered the speed of the earth's rotation, the tilt of its axis, and the shape of its gravitational field."

Can dams be removed and the damage undone? Environmentalists say yes, calling it "destruction in the name of creation.