A giant seaweed bloom that can be seen from space threatens beaches in Florida and Mexico. Spanning roughly 5,000 miles — about twice the width of the United States — the thick blanket of sargassum floats between the Gulf of Mexico and the shores of West Africa. Scientists say this bloom is one of the largest on record. Beaches in Key West are already being inundated with algae. Parts of Mexico’s Yucatán Peninsula, including Cancun, Playa del Carmen and Tulum, are preparing for up to 3 feet of sargassum buildup in the coming days.
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