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I've brought that topic up already; that warming has been a good thing for humanity so far. It's unclear if that trend will continue, but we're certainly better off than the ice age 11,000 years ago.
Somewhere there is an ideal mean temperature for the earth, and finding out what that is seems nearly impossible to calculate. My WAG is that the ideal temp is slightly higher than current, but not much higher. Any warmer than that ideal temp, and the negative consequences start to nudge out the positive ones.
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