Scientists assert that climate change is driven by the burning of fossil fuels, which emit greenhouse gases such as carbon dioxide. The National Resources Defense Council (NRDC), an environmental group, notes that "Coal-burning power plants are the largest U.S. source of carbon dioxide pollution." One of the main suggestions scientists have proposed for reducing fossil fuel, therefore, is to move away from coal and petroleum and toward renewable energy resources: As the NRDC says, "We can increase our reliance on renewable energy sources such as wind, sun and geothermal."1
Another potential source of renewable energy is water power, or hydropower. Water power comes in a number of different forms.
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