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In this Aug. 2014 file photo, algae is seen near the City of Toledo water intake crib in Lake Erie, about 2.5 miles off the shore of Curtice, Ohio. Environmentalists, scientists and farmers agree that agriculture runoff is feeding the blue-green algae blooms on Lake Erie that are linked to the toxins found in the drinking water of 400,000 people last weekend. But how much of a role do the farms play? Researchers know some of the answers, yet there are still many unknowns. (AP Photo/Haraz N. Ghanbari)