Climate modeling failure by the IPCC's past climate models is huge and well documented - the newest climate models are no better
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Read here. Expert analyst Bob Tisdale performs a close scrutiny of the new IPCC climate models and discovers they still do an abysmal job at predicting the past ('hindcast' of) global temperatures.
Despite billions of dollars of climate modeling expenditures and millions of person-hours of software efforts by model programmers since 2007, the latest and greatest computer simulations still cannot accurately portray the known past.
Adding misery to an already abysmal failure, the newest models' predictive outputs are barely different than the older models. Just as a reminder of the worthlessness of IPCC computer simulations, there is not a single past climate model that predicted this massive change in climate.