Ok im confused about "facts" regarding global warming

[AlexM]

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It seems to me as if it would be relatively simple to perform experiments to determine if CO2 does indeed contribute to the greenhouse effect in a laboratory setting, and I assume that these experiments have been done and that the conclusion is affirmative.

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And you would be completely and totally wrong. The ice samples are the primary source of data.

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Are you saying that ice core data are the primary reason for believing whether or not CO2 causes warming?

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No, I'm saying they're the primary source of actual scientific data. The primary reason people believe in it is the unscientific coincidence between rising temperatures and man-made CO2 over the last 100 years, the statistical equivalent of 100 hands of poker. I have never seen any actual scientific evidence to support this belief, and the ice core samples completely refute it (although I do question the accuracy of the ice core samples as well).