America has virtually limitless potential for the generation of power from natural forces. By ramping up our use of wind power, solar photovoltaic and thermal power, geothermal heat pumps, and other renewable forms of energy — and using much of that energy to replace power production at dirty, coal-fired power plants — the United States could dramatically reduce global warming emissions from electric power production. Requiring that 20% of our electricity come from renewable sources by 2020 — when combined with a strong, mandatory cap on global warming pollution — would save more than
500 million metric tons of carbon dioxide equivalent relative to 2004 emissions levels. This is more than one-third of the emissions reductions scientists say we need to achieve by 2020.60
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