The new rules' would reduce harmful emissions, the EPA says. David Paul Morris/Getty Images hide caption

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Heron Island is located on the southern end of the Great Barrier Reef, about 25 miles off the northeast coast of Australia. Ted Mead/Getty Images hide caption

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A Ford Focus electric concept car with a home charging unit on display at the 2013 North American International Auto Show in Detroit, Mich., in January. Stan Honda/AFP/Getty Images hide caption

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A truck carrying hardwood timber drives along a rural road leading to Paragominas, Brazil, on Sept. 23, 2011. The city has become a pioneering "Green City," a model of sustainability with a new economic approach that has seen illegal deforestation virtually halted. Andre Penner/AP hide caption

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A condemned house in the Ocean Breeze area of New York City's Staten Island. Most homes in the seaside community were inundated by the ocean surge from superstorm Sandy. John Moore/Getty Images hide caption

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Former South Carolina Republican Rep. Bob Inglis now runs the Energy and Enterprise Initiative. /Energy and Enterprise Initiative hide caption

itoggle caption /Energy and Enterprise Initiative

The Michigan Gala apples on this packing line will soon be in short supply. After a mild fall and winter, then a late-April freeze, Michigan's apple cultivation has dropped 90 percent. Noah Adams/NPR hide caption

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Attendees of Apple's 2012 World Wide Developers Conference look at the new MacBook Pro with Retina display. Justin Sullivan/Getty Images hide caption

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