“I wonder how much comes from the decayed carcasses of salmon who died after the spawning run, and then is carried downstream?”
Well, I know salmon (why’s that got that l in it?) swims fast and mercury is called quick silver, but I really don’t think they’re related.
It may not apply here, and may just be a quirk of global wind circulation (from Chinese or Russian power plants)--who knows. My bet is that if more grant money leads to more studies with similar results, there will be yet another push to use the information to shut down industry in the US, and not elsewhere.