Environment
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In this photo taken on Tuesday, March 18, 2014, dust blows tumbleweeds against a fence east of the Comanche Power Plant near Pueblo, Colo., as high winds caused visibility and air quality problems across the area. Crowley County, high plains country o f ranching and farming east of Pueblo, has spent $108,000 since November, more than a third of its annual budget, clearing roads and bridges of tumbleweed to make sure residents and emergency vehicles can move. (AP Photo/The Pueblo Chieftain, Chris McLean)

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A flight crewman from a Royal Australian Air Force P-3 Orion walks towards the aircraft at RAAF Base Pearce as it arrives back from the on-going search operations for missing Malaysia Airlines Flight MH370 in Perth, Australia, Tuesday, April 8, 2014. Search crews have failed to relocate faint sounds heard deep in the Indian Ocean, possibly from the missing Malaysian jetliner's black boxes whose batteries are at the end of their life. (AP Photo/Rob Griffith)

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This image provided by the Joint Agency Coordination Centre on Wednesday, April 9, 2014, shows a map indicating the locations of signals detected by vessels looking for signs of the missing Malaysia Airlines Flight 370 in the southern Indian Ocean. An Australian official overseeing the search for the missing Malaysia Airlines plane said underwater sounds picked up by equipment on an Australian navy ship are consistent with transmissions from black box recorders on a plane. (AP Photo/Joint Agency Coordination Centre) EDITORIAL USE ONLY

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This image provided by the Joint Agency Coordination Centre on Wednesday, April 9, 2014, shows a map indicating the locations of signals detected by vessels looking for signs of the missing Malaysia Airlines Flight 370 in the southern Indian Ocean. An Australian official overseeing the search for the missing Malaysia Airlines plane said underwater sounds picked up by equipment on an Australian navy ship are consistent with transmissions from black box recorders on a plane. (AP Photo/Joint Agency Coordination Centre) EDITORIAL USE ONLY

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Gone this year is the Eisenhower Tree (left), about the only feature that gave definition to perhaps the dullest hole on the back nine of the Masters. The 125-year-old loblolly pine fell victim this winter to an ice storm. Except for the historical significance, hardly anyone will miss it. (Associated Press)

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Flight crew from a Royal Australian Air Force P-3 Orion walk towards the aircraft at RAAF Base Pearce as it arrives back from the on-going search operations for missing Malaysia Airlines Flight 370 in Perth, Australia, Tuesday, April 8, 2014. Search crews have failed to relocate faint sounds heard deep in the Indian Ocean, possibly from the missing jetliner's black boxes whose batteries are at the end of their life. (AP Photo/Rob Griffith)

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In this April 7, 2014 photo provided by the Australian Defense Force Able Seaman Clearance Divers Matthew Johnston, right, and Michael Arnold, from the Australian Defense Vessel Ocean Shield, scan the water for debris from the missing Malaysia Airlines Flight 370 in the southern Indian Ocean. Up to 14 planes and as many ships were focusing on a single search area covering 77, 580 square kilometers (29,954 square miles) of ocean, 2,270 kilometers (1,400 miles) northwest of the Australian west coast city of Perth, Australia. (AP Photo/Australian Defense Force, Lt. Ryan Davis) EDITORIAL USE ONLY

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Cattle belonging to Cliven Bundy are rounded up with a helicopter near Bunkerville Nev. Monday, April 7, 2014. The Bureau of Land Management has begun to round up what they call "trespass cattle" that rancher Cliven Bundy has been grazing in the Gold Butte area 80 miles northeast of Las Vegas. (AP Photo/Las Vegas Review-Journal, John Locher)

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Contractors for the Bureau of Land Management round up cattle belonging to Cliven Bundy with a helicopter near Bunkerville, Nev. Monday, April 7, 2014. The Bureau of Land Management has begun to round up what they call "trespass cattle" that rancher Cliven Bundy has been grazing in the Gold Butte area 80 miles northeast of Las Vegas. (AP Photo/Las Vegas Review-Journal, John Locher)