https://www.mercurynews.com/2023/03/15/a-massive-seaweed-blob-is-headed-to-florida-rotten-stench-included/

A blob of sargassum seaweed thousands of miles long is headed to Florida, the Caribbean and eventually the Gulf of Mexico, scientists say.

Dubbed the Great Atlantic Sargassum Belt by scientists, the swath of tendrilled, somewhat rubbery seaweed has become an annual, often stinky occurrence in the last few years, swamping beaches and resorts from South Florida, through the Caribbean and into the Gulf of Mexico with mats of the macroalgae, which then decomposes, releasing hydrogen sulfide. The gas has an odor reminiscent of rotten eggs, and can cause respiratory problems.