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An Ice Age only assumes that the Earth's climate won't fall into the runaway greenhouse. Also the last ice age had nothing to do with rebuilding the atmosphere, it was a period when the earth's wobble and rotation put it at it's furthest from the Sun and at it's worst angle for absorbtion of the Sun's heat. Oh and most ice ages lasted a few 10s of thousands of years, good luck humanity surviving that with any ease ;]) There's only so much space around the tropical and equatorial regions. Book now to avoid disappointment ;])
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