> [*] lead and all other 'bad' substances originate from this planet. Unless
> there is a racket going on unnoticed by anyone, that smuggles lead,
> cadmium, mercury and other 'nasty' substances in from outer space, it's
> ALL NATURAL.

I don't think the question here is whether it's "natural" :)

Nature in itself would continue to be perfectly "natural" even if we or
something else manages to blow up this planet, with everything on it.

And I'm sure you know of a large amount of perfectly "natural" substances
you don't want to find anywhere near you -- or your stomach or your
bloodstream :)

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