Environment
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An Afghan farmer works on a poppy field in the Khogyani district of Jalalabad, east of Kabul. Last May's harvest produced a staggering 6,000 tons of opium, 49 percent higher than the previous year and more than the combined output of the rest of the world, according to a report issued Wednesday. (Associated Press)

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Milous Osier, left, and Jackie Foulkes look through debris at Vilonia Realty in Vilonia, Ark., Wednesday, April 30, 2014. A tornado struck the town late Sunday. Along stretches of damaged houses, volunteers with chain saws cleared trees from across homes, driveways and streets. (AP Photo/Danny Johnston)

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A volunteer throws debris from a destroyed house onto a fire in Vilonia, Ark., Wednesday, April 30, 2014. Sunday's storm killed more than a dozen people in Arkansas as it roared through some 80 miles of the state. (AP Photo/Danny Johnston)

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Firefighters look at a car sitting on the edge of a sinkhole in the Charles Village neighborhood of Baltimore, Wednesday, April 30, 2014, as heavy rain moves through the region. Road closures have been reported due to flooding, downed trees and electrical lines elsewhere in the Mid-Atlantic. The National Weather Service issued flash flood warnings through Wednesday afternoon in Washington, northern Virginia and central Maryland. (AP Photo)

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Employees from Learn It Systems help push coworker Russell Lum's car to higher ground after it was flooded in a parking lot, back, in Baltimore, Wednesday, April 30, 2014. Road closures have been reported due to flooding, downed trees and electrical lines elsewhere in the Mid-Atlantic. The National Weather Service issued flash flood warnings through Wednesday afternoon in Washington, northern Virginia and central Maryland. (AP Photo)

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Emergency officials are seen through a CSX railroad tunnel near debris that fell onto tracks in the Charles Village neighborhood of Baltimore, Wednesday, April 30, 2014, as heavy rain moves through the region. Road closures have been reported due to flooding, downed trees and electrical lines elsewhere in the Mid-Atlantic. The National Weather Service issued flash flood warnings through Wednesday afternoon in Washington, northern Virginia and central Maryland. (AP Photo)