Environment

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FILE -This Dec. 5, 2012, file photo shows Sen. Mary Landrieu, D-La. on Capitol Hill in Washington. An indefinite extension to the government’s review of the contentious Keystone oil pipeline, announced late Friday, April 18, 2014, by the State Department, is doing little to quell the political posturing over the project, which has taken on a life of its own as climate change activists duke it out with energy advocates from both parties. For Landrieu, whose competitive race in Louisiana will help determine whether Democrats retain control of the Senate, the delay comes at a particularly sensitive moment. Landrieu recently took the helm of the Senate Energy Committee, and has been touting her new position to argue that she offers voters in oil-dependent Louisiana the best chance to influence America’s energy policies _ including approval of Keystone XL. (AP Photo/Manuel Balce Ceneta, File)

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Dawa Yangzum, right, a relative of Nepalese Sherpa Dawa Tashi, who was injured during an avalanche, waits at a hospital in Katmandu, Nepal, Friday, April 18, 2014. An avalanche swept down a climbing route on Mount Everest early Friday, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Niranjan Shrestha)

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Hospital staff get ready to receive the injured from an avalanche on the helipad of Grandy hospital, in Katmandu, Nepal, Friday, April 18, 2014An avalanche swept down a climbing route on Mount Everest early Friday, killing at least 12 Nepalese guides and leaving three missing in the deadliest disaster on the world's highest peak. (AP Photo/Niranjan Shrestha)

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fLos Angeles Dodgers starting pitcher Zack Greinke throws to an Arizona Diamondbacks batter during first inning of a baseball in Los Angeles, Friday, April 18, 2014. (AP Photo/Chris Carlson)

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Houston Astros' Paul Clemens pitches to an Oakland Athletics batter in the second inning of a baseball game Friday, April 18, 2014, in Oakland, Calif. (AP Photo/Ben Margot)

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Deputy Revenue Commissioner Mike Pawlowski, left, addresses members of the House Finance Committee as the committee prepares to advance the governor's gas line bill on Friday, April 18, 2014, in Juneau, Alaska. Also shown is Revenue Commissioner Angela Rodell and Natural Resources Commissioner Joe Balash. (AP Photo/Becky Bohrer)

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Members of Gov. Sean Parnell's administration address the House Finance Committee as the committee prepares to advance the governor's gas line bill on Friday, April 18, 2014, in Juneau, Alaska. (AP Photo/Becky Bohrer)

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This aerial image provided by Tributary Environmental shows a home damaged by a landslide Friday, April 18, 2014 in Jackson, Wyo. A slow-moving landslide in Jackson sped up significantly Friday, splitting this house in two, causing a huge uplift in a road and a Walgreens parking lot, and threatening to destroy several other unoccupied homes and businesses. (AP Photo/Tributary Environmental) NO SALES

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In this photo provided by Joanne Dollarton, fire engulfs three homes near the beachfront, Friday, April 18, 2014, in Sea Isle City, N.J. Authorities say no injuries have been reported in the smoky fire, which erupted around 4:30 p.m. Friday and sent large clouds of black smoke spewing across the region. It was brought under control about two hours later. (AP Photo/Joanne Dollarton) MANDATORY CREDIT

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Firefighters stand at the scene where three homes were destroyed by a fire that broke out near the beachfront, Friday, April 18, 2014, in Sea Isle City, N.J. Authorities say no injuries have been reported in the smoky fire, which erupted around 4:30 p.m. Friday and sent large clouds of black smoke spewing across the region. It was brought under control about two hours later. (AP Photo/The Press of Atlantic City, Edward Lea) MANDATORY CREDIT

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Smoke rises from where three homes were destroyed by a fire that broke out near the beachfront, Friday, April 18, 2014, in Sea Isle City, N.J. Authorities say no injuries have been reported in the smoky fire, which erupted around 4:30 p.m. Friday and sent large clouds of black smoke spewing across the region. It was brought under control about two hours later. (AP Photo/The Press of Atlantic City, Edward Lea) MANDATORY CREDIT

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Firefighters work the scene where three homes were destroyed by a fire that broke out near the beachfront, Friday, April 18, 2014, in Sea Isle City, N.J. Authorities say no injuries have been reported in the smoky fire, which erupted around 4:30 p.m. Friday and sent large clouds of black smoke spewing across the region. It was brought under control about two hours later. (AP Photo/The Press of Atlantic City, Edward Lea) MANDATORY CREDIT

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People watch as firefighters work the scene where three homes were destroyed by a fire that broke out near the beachfront, Friday, April 18, 2014, in Sea Isle City, N.J. Authorities say no injuries have been reported in the smoky fire, which erupted around 4:30 p.m. Friday and sent large clouds of black smoke spewing across the region. It was brought under control about two hours later. (AP Photo/The Press of Atlantic City, Edward Lea) MANDATORY CREDIT