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Associated Press
FILE- In this  Dec. 6, 2011, file, photo, owner Kevin Lunny holds a Pacific oyster at the Drake's Bay Oyster Co. in Point Reyes National Seashore, Calif. Scientists blame higher levels of carbon dioxide in Pacific Ocean waters caused by man-made global warming for the failure of oysters to produce young at an Oregon hatchery. (AP Photo/Eric Risberg, File)

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