Why does Sargassum smell so bad?

When washed ashore, Sargassum will decompose (rot). Rotting Sargassum causes the production of hydrogen sulfide gas which smells like rotten eggs. 

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1. Where does Sargassum come from, and why is it washing ashore?
2. Why is Sargassum a concern?
3. Why does Sargassum smell so bad?
4. How can hydrogen sulfide affect my health?
5. Does Sargassum cause skin rashes and blisters?
6. Will hydrogen sulfide from rotting Sargassum cause cancer or other long term health effects?
7. Can I use Sargassum in cooking?
8. How can I protect myself and my family from exposure to Sargassum?