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Is there already a suitable supply chain for that to happen?

Algae grows ridiculously easily - If there was a market for this (likely one driven by mandates to eliminate methane), you could have thousands of tons of algae within months and millions of tons within years.

It's a staple of coastal people's diets the world over. There's half an aisle of it at the local Seattle-area groceries.

Also, I don't think algae and seaweed is the same thing?

Seaweed is a form of algae.

Interesting. I hadn't been paying attention to this, but it seems accurate: https://caes.ucdavis.edu/news/feeding-cattle-seaweed-reduces...

Yes, assuming the research is correct, this would seem like the sort of thing that should be mandated.

Might be better to do it with a pollution tax. Punish losers but don't mandate a winner, you know.