That has nothing to do with crude oil. Nor toxins, really. Eutrophication of waterways occurs because of addition of nutrients that encourages growth, not toxins that prevent it.
I agree not pertinent to crude oil. Toxin is a broad term. It is anything that when added at a sufficient quantity to create a toxic environment. The waterways I refer to are poisoned by nitrogen. The overall discussion was about focusing on keeping existing environments clean as opposed to jumping to new (relatively) pristine environments. It is the idea 'if you can't take care of your existing toys, you don't get new ones.'
