Sargassum Caribbean 2025. Since 2011, vast mats of sargassum seaweed have been washing up on caribbean islands. We are the world’s n°1 sargassum citizen science network.
We monitor all areas and countries affected by sargassum. The explosive growth of a type of seaweed called sargassum is wreaking havoc on economies, coastal environments and human health across the islands.
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