Environment

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Rescue workers use chainsaws and other tools to dig through a tangle of trees and mud marked as having a possible victim of the Oso mudslide along State Route 530 near Darrington, Wash. Rescue and recovery workers slogged through thick mud and debris as rain poured down on the area one week after the devastating disaster. Photographed on Saturday, March 29, 2014. (AP Photo/seattlepi.com, Joshua Trujillo)

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A basketball floats amid muck and debris left by the Oso mudslide along State Route 530 near Darrington, Wash., Saturday March 29, 2014. Rescue and recovery workers slogged through thick mud and debris as rain poured down on the area one week after the devastating disaster. (AP Photo/seattlepi.com, Joshua Trujillo)

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RAAF pilot Flight Lt. Russell Adams speaks to the media after his AP-3C Orion returned from the search for missing Malaysia Airlines Flight MH370 in Perth, Australia, Sunday, March 30, 2014. Adams said his crew spotted several items orange in color as large as two meters in size that were of interest and images of these items have been passed onto the Rescue Coordination Center to be analyzed.(AP Photo/Rob Griffith)

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A woman walks her dog past a broken block wall in Fullerton, Calif., on Saturday, March 29, 2014, after an earthquake hit Orange County Friday night. More than 100 aftershocks have rattled Orange County south of Los Angeles where a magnitude-5.1 earthquake struck Friday. Despite the relatively minor damage, no injuries have been reported. (AP Photo/The Orange County Register, Ken Steinhardt) MAGS OUT; LOS ANGELES TIMES OUT

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A CalTrans worker and a geologist look at a rock wall where a rockslide closed Carbon Canyon Road near Carbon Canyon Regional Park in Brea, Calif., on Saturday, March 29, 2014 after an earthquake hit Orange County Friday night. More than 100 aftershocks have rattled Orange County south of Los Angeles where a magnitude-5.1 earthquake struck Friday. Despite the relatively minor damage, no injuries have been reported. (AP Photo/The Orange County Register, Ken Steinhardt) MAGS OUT; LOS ANGELES TIMES OUT

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A broken block wall blocks the sidewalk Saturday, March 29, 2014, after an earthquake hit Orange County Friday night in Fullerton, Calif. More than 100 aftershocks have rattled Orange County south of Los Angeles where a magnitude-5.1 earthquake struck Friday. Despite the relatively minor damage, no injuries have been reported. (AP Photo/The Orange County Register, Ken Steinhardt) MAGS OUT; LOS ANGELES TIMES OUT

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Orange County Parks grounds keeper Frank Amaro removes the supports to the sign at the entrance of Ralph B. Clark Regional Park in Buena Park in Fullerton, Calif., on Saturday, March 29, 2014, morning after rangers discovered it fell off it's supports after an earthquake hit Orange County Friday night. More than 100 aftershocks have rattled Orange County south of Los Angeles where a magnitude-5.1 earthquake struck Friday. Despite the relatively minor damage, no injuries have been reported. (AP Photo/The Orange County Register, Ken Steinhardt) MAGS OUT; LOS ANGELES TIMES OUT

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In this March 20, 2014 photo, Bruce Clingan, who owns the Tanglewood Golf Course, poses for a photo with a lease he signed with gas drilling company Hilcorp in his home in Pulaski, Pa. Clingan is one of a group of property owners in the area that signed a lease that is hoping to start collecting royalty checks from the gas under their land. Hilcorp has asked state officials to invoke a 1961 law in the rural area and allow Utica Shale well bores under the property of four landowners who haven’t signed leases. (AP Photo/Keith Srakocic)

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In this March 20, 2014 photo, equipment is parked at a gas well drilling site in Pulaski, Pa. The gas drilling company Hilcorp that is working the well has asked state officials to invoke a 1961 law in the rural area and allow Utica Shale well bores under the property of four landowners who haven’t signed leases. (AP Photo/Keith Srakocic)

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In this March 20, 2014 photo, a sign near a gas well drilling site is visible near a road in Pulaski, Pa. The gas drilling company Hilcorp that is working the well has asked state officials to invoke a 1961 law in the rural area and allow Utica Shale well bores under the property of four landowners who have not signed leases. (AP Photo/Keith Srakocic)

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FILE - In this Dec. 30, 2008 file photo, two wind turbines stand near a traditional windmill on a farm near Mount Carmel, Iowa. The Iowa Senate passed bills to triple the amount of solar energy tax credits available to farmers, homeowners, and businesses and to extend the deadline to complete wind turbine projects and still qualify for a tax break. (AP Photo/Charlie Neibergall, File)

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FILE - In this Dec. 30, 2008 file photo, wind turbines stand on a farm field near Mount Carmel, Iowa. The Iowa Senate passed bills to triple the amount of solar energy tax credits available to farmers, homeowners, and businesses and to extend the deadline to complete wind turbine projects and still qualify for a tax break. (AP Photo/Charlie Neibergall, File)