Glossary of "Environmental Science: Earth as a Living Planet (2nd ed.)" by Botkin & Keller (1998)
- Alternative energy source derived from flowing water. One of the world’s oldest and most common energy sources. Sources vary in size from microhydropower systems to large reservoirs and dams.
- Botkin, D. B. & Keller, E. A. 1998. Environmental Science: Earth as a Living Planet, 2nd ed. -xxxxii + 649 pp. John Wiley & Sons, Inc., New York.