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Posted: 5/2/2013 2:43:29 PM EST
FILE - In this April 8, 2013, file photo, an employee of energy company Eon Hanse walks across the premises of the natural gas storage facility in Hamburg-Reitbrook, Germany. Clean Energy refers to energy that pollutes less than coal and oil, the dominant sources of fuel for electricity and transportation. Natural gas is considered by some, including the Obama administration, to be clean because it emits far fewer pollutants than coal or oil. Others consider only renewable energy truly clean. (AP Photo/dpa, Bodo Marks)
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Posted: 3/20/2013 7:28:37 AM EST
FILE - A protestor is detained on Capitol Hill in Washington on Monday, Oct. 22, 2007 after blocking a roadway near the Capitol as anti-war and clean energy groups gathered for non-violent civil disobedience. (AP Photo/Caleb Jones, File)
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Posted: 3/15/2013 3:43:54 PM EST
President Barack Obama speaks at Argonne National Laboratory in Argonne, Ill., Friday, March 15, 2013. The president urged congress to authorize $200 million a year for research into clean energy technologies that can wean automobiles off oil. (AP Photo/M. Spencer Green)
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Posted: 3/5/2013 5:28:57 PM EST
FILE - In this Sept. 4, 2008, file photo, Garvin Cui fuels up his natural gas vehicle at a Clean Energy station in San Francisco. New technology has unlocked vast reserves of natural gas in deep rock formations, creating a natural gas glut that has depressed prices. That makes natural gas more attractive as a transportation fuel. (AP Photo/Marcio Jose Sanchez, File)
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Posted: 8/7/2012 9:28:17 PM EST
U.S. Sen. Harry Reid, D-Nev., speaks at the National Clean Energy Summit at the Bellagio in Las Vegas on Tuesday, Aug. 7, 2012. Before the beginning of the annual conference, Sen. Reid announced that U.S. wind power now has 50 gigawatts of electric generating capacity in a press conference before the summit. (AP Photo/Las Vegas Review-Journal, Jessica Ebelhar)
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Posted: 8/7/2012 9:28:17 PM EST
Secretary of the Interior Ken Salazar speaks at the National Clean Energy Summit at the Bellagio in Las Vegas on Tuesday, Aug. 7, 2012. Before the beginning of the annual conference, he announced with Sen. Harry Reid that U.S. wind power now has 50 gigawatts of electric generating capacity. (AP Photo/Las Vegas Review-Journal, Jessica Ebelhar)
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Posted: 8/7/2012 9:28:17 PM EST
U.S. Sen. Harry Reid, D-Nev., speaks at the National Clean Energy Summit at the Bellagio in Las Vegas on Tuesday, Aug. 7, 2012. Before the beginning of the annual conference, Sen. Reid announced that U.S. wind power now has 50 gigawatts of electric generating capacity in a press conference before the summit. (AP Photo/Las Vegas Review-Journal, Jessica Ebelhar)
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Posted: 8/7/2012 9:28:17 PM EST
U.S. Sen. Harry Reid, D-Nev., speaks at the National Clean Energy Summit at the Bellagio in Las Vegas on Tuesday, Aug. 7, 2012. Before the beginning of the annual conference, Sen. Reid announced that U.S. wind power now has 50 gigawatts of electric generating capacity in a press conference before the summit. (AP Photo/Las Vegas Review-Journal, Jessica Ebelhar)
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Posted: 8/7/2012 9:28:17 PM EST
U.S. Sen. Harry Reid, D-Nev., speaks at the National Clean Energy Summit at the Bellagio in Las Vegas on Tuesday, Aug. 7, 2012. Before the beginning of the annual conference, Sen. Reid announced that U.S. wind power now has 50 gigawatts of electric generating capacity in a press conference before the summit. (AP Photo/Las Vegas Review-Journal, Jessica Ebelhar)
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Posted: 8/7/2012 9:28:17 PM EST
Secretary of the Interior Ken Salazar speaks at the National Clean Energy Summit at the Bellagio in Las Vegas on Tuesday, Aug. 7, 2012. Before the beginning of the annual conference, he announced with Sen. Harry Reid that U.S. wind power now has 50 gigawatts of electric generating capacity. (AP Photo/Las Vegas Review-Journal, Jessica Ebelhar)
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Posted: 8/7/2012 9:28:17 PM EST
Secretary of the Interior Ken Salazar speaks at the National Clean Energy Summit at the Bellagio in Las Vegas on Tuesday, Aug. 7, 2012. Before the beginning of the annual conference, he announced with Sen. Harry Reid that U.S. wind power now has 50 gigawatts of electric generating capacity. (AP Photo/Las Vegas Review-Journal, Jessica Ebelhar)
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Posted: 8/7/2012 9:28:17 PM EST
U.S. Sen. Harry Reid, D-Nev., stands with members of the Moapa Paiute Tribe, the Sierra Club and the Nevada Conservation League during a news conference at the National Clean Energy Summit 5.0 at the Bellagio in Las Vegas on Tuesday, Aug. 7, 2012. Reid is calling for the closure of NV Energy's Reid Gardner coal-fired station near Moapa, citing health risks to those who live near the plant. (AP Photo/Las Vegas Review-Journal, Jessica Ebelhar)
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Posted: 8/7/2012 9:28:17 PM EST
Iris Daboda holds a sign during a rally challenging NV Energy to transition away from coal outside the National Clean Energy Summit 5.0 at the Bellagio hotel and casino in Las Vegas on Tuesday, Aug. 7, 2012. Daboda is a tribe member the Moapa Band of Paiutes. At the summit today, U.S. Sen. Harry Reid called for the closure of NV Energy's Reid Gardner coal-fired station near Moapa, citing health risks to those who live near the plant. About two dozen people attended the rally. (AP Photo/Las Vegas Review-Journal, Jessica Ebelhar)
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Posted: 6/22/2012 12:23:52 PM EST
A woman sells ice cream to indigenous people while they form an image as a "human banner" to promote clean energy source and the importance of free-running rivers during the People's Summit at Rio+20 for Social and Environmental Justice in Rio de Janeiro June 19, 2012. REUTERS/Ricardo Moraes
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Posted: 6/20/2012 6:47:35 PM EST
A woman sells ice cream to indigenous people while they form an image as a "human banner" to promote clean energy source and the importance of free-running rivers during the People's Summit at Rio+20 for Social and Environmental Justice in Rio de Janeiro June 19, 2012. REUTERS/Ricardo Moraes
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Posted: 6/20/2012 6:47:35 PM EST
A woman sells ice cream to indigenous people while they form an image as a "human banner" to promote clean energy source and the importance of free-running rivers during the People's Summit at Rio+20 for Social and Environmental Justice in Rio de Janeiro June 19, 2012. REUTERS/Ricardo Moraes
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Posted: 6/20/2012 5:09:36 PM EST
A woman sells ice cream to indigenous people while they form an image as a "human banner" to promote clean energy source and the importance of free-running rivers during the People's Summit at Rio+20 for Social and Environmental Justice in Rio de Janeiro June 19, 2012. REUTERS/Ricardo Moraes
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Posted: 6/20/2012 5:09:36 PM EST
A woman sells ice cream to indigenous people while they form an image as a "human banner" to promote clean energy source and the importance of free-running rivers during the People's Summit at Rio+20 for Social and Environmental Justice in Rio de Janeiro June 19, 2012. REUTERS/Ricardo Moraes
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Posted: 6/20/2012 4:52:10 PM EST
A woman sells ice cream to indigenous people while they form an image as a "human banner" to promote clean energy source and the importance of free-running rivers during the People's Summit at Rio+20 for Social and Environmental Justice in Rio de Janeiro June 19, 2012. REUTERS/Ricardo Moraes
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Posted: 6/19/2012 5:10:16 PM EST
A woman sells ice cream to indigenous people while they form an image as a "human banner" to promote clean energy source and the importance of free-running rivers during the People's Summit at Rio+20 for Social and Environmental Justice in Rio de Janeiro June 19, 2012. REUTERS/Ricardo Moraes
