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Actually, the birth rate in Western nations is well below replacement level in some countries, and certainly has decreased significantly in just a century. And its fairly likely that with Western influence and contraception, birth rates will drop in Africa and Asia too. Also, those doomsday prediction are based on computer models, not historic observation.
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And look at temperatures in the Cambrian, before land plants, whn the CO2 level was huge. Bad. We do not want that much CO2.