Washington, D.C. – If you’ve been to a beach this summer, anywhere from Texas to the Carolinas, you’ve likely seen it. Masses of brown seaweed, sometimes a few clumps, often big mounds, line the shore. It’s sargassum, a floating weed that’s clogging bays and piling up on beaches in the Gulf and Caribbean.
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Masses Of Seaweed Threaten Fisheries And Foul Beaches

A picture taken in April shows sargassum seaweed on the French Caribbean Island of Guadeloupe. Helene Valenzuela /AFP/Getty Images
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