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I'm uncertain.
Age of earth: 4.6 billion years.
What we think are trends might just be ripples from a grain of sand tossed into the ocean in the grand scheme of things.
I'll cut it short at that.....
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Ditto. I absolutely think there is WAY too much pollution on the planet, but I'm unconvinced that mankind has managed in 150 years to ruin with technology what took 4.6 billion years (I'm borrowing your stats) to create and has no doubt survived alot worse than car exhaust or a cow fart.
Still, I'm pretty "green" as the hippies like to say, kind of like an environmentalist with a 12 gauge.