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The answer is not for California to get even more strict, the answer is for the US & Europe to impose conditions over China and India. We could lobby the Chinese gov't to prove their factories are meeting clean air emissions or importation wouldn't be allowed. I
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It always the other party that has to change isn't it?
Working on getting cleaner techonolgy and green energy sources could have more impact than trying to lobby China into changing.
Stricter regulation create a climate where there is higher payoff in developing green techonolgy.
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I think its pretty impressive that a scientist can tell us what the CO2 levels were 400,000 years ago. How do they do it?
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The life on this earth is adepted to the present weather and not the weather that was 400,000 years ago.
Genetic changes can very well need a few hundred or thousand years to make that adeption to be able to life with the weather from that time.
If our weather adepts to fast natural selection won't be fast enough to make such changes.