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Originally Posted by Manx
The point is not important. You could just as easily say nothing is artificial and therefore there can be no artificially ccreated consequences.
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Not true.
Polychlorinated byphenols, or PCBs are not a naturally occuring substance that has been introduced into the ecosystem and had devestating effects.
Still, refining a substance, such as mercury, can change the way in which we must deal with it's disposal.
My point however, is that the 'ecosystem' can usually deal with a certain amount of a naturally occuring substance, such as U235, mercury, asbestos, etc, whereas it might not be able to deal with another substance, such as PCB.
But once again, substance, form and quantity must be addressed for the specific situation.