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Because I thought global warming would cause more moisture in the air, hence more clouds, hence more cooling.
You're assuming our atmosphere will trap all water vapor during the global warming process? Bad assumption considering the earth's magnetic shield, which is responcible for containing our atmosphere is also in the process of polarity reversal. While this happens over the next 250 years, cosmic radiation that penitrates the stratosphere will not only be allowed in, to some degree the contents of our atmoshere will also be allowed to escape.