A record tide of sargassum is burying Caribbean beaches in 2026, and a generation of island entrepreneurs is betting the same seaweed can be turned into fuel, fertilizer, and a new blue economy.
By late May, satellites at the University of South Florida tracked roughly 28.9 million metric tons of sargassum across the Atlantic, Caribbean, and Gulf, putting 2026 on course to break last year's record. Offshore the brown seaweed shelters fish and turtles, but onshore it rots in the sun, releasing the hydrogen sulfide stench that empties hotels and, in Martinique and Guadeloupe, has been tied to headaches, breathing trouble, and pregnancy complications. The cost is blunt: removal drains public budgets, and in the worst-hit Mexican resorts some hotels have slashed rates by up to 40 percent to hold onto guests.
Yet the same tide is being reimagined as a resource. In Grenada, a startup called SarGas captures the methane sargassum would otherwise leak and burns it as biogas, first to fuel a bakery and now, with a bigger digester planned, to feed a grid that runs almost entirely on costly imported diesel. Companies in the Dominican Republic, Barbados, and Mexico are piloting fertilizers, animal feed, cosmetics, and biofuels, and a regional study rates biochar, biogas, and compost the most investable, cheap to start and hungry enough to consume what the tides dump ashore. The blooms are unpredictable and island budgets thin, but the prize is a practical sovereignty: a Caribbean that imports less of its energy and fertilizer because it learned to harvest what the ocean keeps sending.
The seaweed will keep coming, and the choice is whether to endure it or to claim it.
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