Caribbean and Florida Beaches Swamped by Sargassum Blooms

Massive accumulations of brown algae (sargassum) are drifting from the Atlantic toward the Caribbean and Florida coasts, creating dense layers on beaches that emit a strong, unpleasant odor. The decay of the algae hampers swimming and reduces the sanitary appeal of popular tourist destinations.

Scientists link the phenomenon to a combination of factors, including nutrient-rich runoff from the Amazon River, changes in climate that alter precipitation and ocean circulation, and upwelling of deep, nutrient‑laden waters off West Africa. The algae have already impacted Mexican resorts such as Cancún, Playa del Carmen, Tulum and Puerto Morelos, as well as the Florida Keys, Barbados, Puerto Rico, Jamaica, the Dominican Republic and parts of the Lesser Antilles.

The surge in sargassum threatens the attractiveness of these beach resorts, posing economic challenges for tourism‑dependent communities across the region.