Much published research on the impact of climate change consists of confirmation bias by if-then modeling, but critics also see an increasing confusion between model outputs and observations.

WSJ: Matt Ridley on Confirmation Bias and Global Warming | Mind & Matter

Spencer, a principal research scientist at the University of Alabama-Huntsville and former senior scientist for climate studies at NASA, has also observed that results of the one or two dozen climate modeling groups around the world often reflect a common bias.

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