Con

A lot of climate change fears are based on predictions and inadequate or flawed computer climate models.

Climate models have been unable to simulate major known features of past climate such as the ice ages or the very warm climates of the Miocene, Eocene, and Cretaceous periods. If models cannot replicate past climate changes they should not be trusted to predict future climate changes. [58] A Asia-Pacific Journal of Atmospheric Science study using observational data rather than computer climate models concluded that “the models are exaggerating climate sensitivity” and overestimate how fast the earth will warm as CO2 levels increase. [75]

Two other studies using observational data found that IPCC projections of future global warming are too high. [76] [97] Climatologist and former NASA scientist Roy Spencer, PhD, concluded that 95% of climate models have “over-forecast the warming trend since 1979.” [77] According to Emeritus Professor of Geography at the University of Winnipeg, Tim Ball, PhD, “IPCC computer climate models are the vehicles of deception… [T]hey create the results they are designed to produce.” [78]

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