ultron
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The Sun beams UV, visible light, mid range IR at Earth. More CO2, more incoming mid range IR is blocked out. Earth's surface becomes cooler. By the Stefan Boltzmann law, Earth's surface's upward mid range IR is much less than before. More CO2 radiating mid range IR back to Earth's surface is negated by much less upward mid range IR from Earth's surface. No net change in the strength of the greenhouse effect. But Earth's surface is cooler to begin with. So more CO2 causes global cooling.
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