I go with the "maybe it's happening and maybe it's man's fault, and we should act as if it is" theory for two reasons:
1. Precautionary Principle
2. Loathing of modern hyperproduction-oriented industrialized consumerized life. If given the chance to send us back to the stone age, I'd do it.
But, in the end, catalytic converters and smokestack scrubbers are merely a meager band-aid on the sucking chest wound that is human existence on the planet, so it doesn't matter what we do.
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