A clump of sargassum weed the size of a soccer ball drifts near Bermuda in the slow swirl of the Sargasso Sea, part of the North Atlantic gyre. A weed mass this small may shelter thousands of ...

Travelers and doctors alike should be aware that prolonged contact with the Sargassum weed, or inhaling the hydrogen sulfide gas it gives off as it decomposes on the beach, can cause heart ...

An curved arrow pointing right. Millions of tons of sargassum wash up on beaches across North America every year. Exposure can lead to breathing problems, and it costs millions to clean it up.