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Wind Turbines: Wind turbines to make clean, renewable energy.
(Bureau of Land Management/U.S. Department of the Interior)

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Pollution from a coal-burning power plant.
(Courtesy of Department of Energy/National Renewable Energy Laboratory)

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Solar Panels Solar panels used in a photovoltaic/hybrid power system, Lake Powell,Utah.
(Courtesy of Department of Energy/National Renewable Energy Laboratory; Credit: Warren Gretz)

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Heliostat for solar power tower.
(Courtesy of Department of Energy/National Renewable Energy Laboratory; Credit: Warren Gretz)

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Beam Machine Cal Sol's solar car, "Beam Machine", from the University of California-Berkeley, in the 2005 American Solar Challenge, a solar car "rayce"
(Courtesy of Department of Energy/National Renewable Energy Laboratory; Credit: Stefano Paltera)

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Simulation of the annual average global warming by the year 2060. (NASA).
(NASA)

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Compressed natural gas (CNG)-powered sanitation truck in New York City.
(Courtesy of Department of Energy/National Renewable Energy Laboratory; Credit: Warren Gretz)

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Rising sea levels would have dramatic effects on regions with low topography like Florida. The dark blue areas are less than 5 meters (16 feet) above sea level.
(Shuttle Radar Topography Mission/NASA)

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Corn, the primary source of ethanol for use as a biofuel.
(Courtesy of Department of Energy/National Renewable Energy Laboratory; Credit: Jim Yost)

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Official seal for USDA-certified organic foods.
(USDA)

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Satellite image showing the decreasing concentration of Arctic sea ice.
(NASA)

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The carbon cycle.
(Energy Information Administration/Department of Energy)

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