33m tons of toxic seaweed clogs Caribbean beaches

A record amount of sargassum has piled up along coastlines of the Caribbean and Gulf of Mexico. Sargassum is a brown seaweed that causes lower oxygen levels and foul-smelling gases when it decomposes on beaches. Researchers and marine scientists have warned that the algae build-up starves underwater plant life of sunlight, affects human health and can leak arsenic into sand