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You cannot choose what the world throws at you so the acceptable amount is the amount that doesn’t cause a problem
What if you have no idea what that amount is?
Then you either don’t know enough about the subject to do anything about it, or it doesn’t matter
That’s not true at all. You need data to tell you the long term effects. You don’t need that same data develop ways to regulate it and remove it.
1,000,000 ppm
