Foreword -- Introduction -- ch. 1. The history of water power -- 1. The history of hydropower / Neil Schlager and Jane Weisblatt, eds. -- 2. How hydropower developed in the United States / U.S. Bureau of Reclamation -- ch. 2. Does water power harm the environment? -- 1. Hydropower dams harm the environment / Elizabeth Grossman -- 2. Hydropower dams contribute to global warming / Patrick McCully -- 3. Hydropower dams can reduce global warming / Alain Tremblay, et al. -- 4. Glen Canyon Dam is harmful and unnecessary / Christopher Peterson -- 5. Glen Canyon Dam is necessary / Paul Ostapuk -- ch. 3. Can water power meet future energy needs? -- 1. Strict regulations can help make hydropower more attractive / Foundation for Water and Energy Education -- 2. Small hydropower projects can benefit rural communities / Patrick McCully -- 3. Ocean temperature gradients could be used to generate electricity / U.S. Department of Energy -- 4. Ocean waves could become an important energy source / Energy Systems Research Unit -- Facts about water -- Glossary -- Chronology -- For further reading -- Index -- Picture credits -- About the editor.