Thankfully we have isotopes to demonstrate the cause and effect relation. Why the article doesn't use that instead of this correlation logic, I don't know, so y

Thankfully we have isotopes to demonstrate the cause and effect relation. Why the article doesn't use that instead of this correlation logic, I don't know, so you're not wrong, but it doesn't seem very relevant to argue here about whether it's caused by us when that's well-established in other ways