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 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.'