Chemicals in Farm Runoff Rattle States on the Mississippi

New York Times: As the surging waters of the Mississippi pass downstream, they leave behind flooded towns and inundated lives and carry forward a brew of farm chemicals and waste that this year — given record flooding — is expected to result in the largest dead zone ever in the Gulf of Mexico. Dead zones have been occurring in the gulf since the 1970s, and studies show that the main culprits are nitrogen and phosphorous from crop fertilizers and animal manure in river runoff. They settle in at the mouth of the......

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