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I have to agree on the 350 ppm figure, but from the opposite direction. Though it might be tolerable, t's probably too high to allow for a pleasant climate. I'm for 280 at a max - but then I think an ice age might well be an improvement on present conditions.
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Define pleasant climate... I can tell you that my definition doesn't involve ice ages, resulting in mass starvation, lower biological productivity and such. Honestly, a real return to ice age condition could well wipe out 2 or even 3 billion people.
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I'd even like to go back to conditions in the late '70s & early '80s, when ski season usually started in October.
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I like skiing too. But you do know that back in the 70s, Time had a magazine cover proclaiming climate alarmism of a different form - global cooling. The cover showed an iced over earth, IIRC.