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By "ever will" I assume that you mean "ever could", since all we have are model simulations or predictions? If that is the case, that the native Americans are polluting Lake Superior more than a open pit iron mine ever could, i.e. by leeching thousands of gallons of sulfuric acid into the watershed, dropping the pH, deoxygenating the water and thereby making it uninhabitable for the current ecosystem, then by all means tell us- what in the world is it that the native Americans are actually doing?