Anyone who says they can confidently predict global climate changes or effects is either a fool or a fraud. No one can even forecast global, national or regional weather conditions that will occur months or years into the future, much less climate shifts that will be realized over decadal, centennial and longer periods.
Nevertheless, this broadly recognized limitation has not dissuaded doomsday prognostications that have prompted incalculably costly global energy and environmental policies. Such postulations attach great credence to computer models and speculative interpretations that have no demonstrated accuracy.
The primary source of scary climate change alarmism routinely trumpeted in the media originates from politically cherry-picked summary report items issued by the U.N.’s Intergovernmental Panel on Climate Change (IPCC). Yet even the IPCC’s 2001 report chapter titled “Model Evaluation“contains this confession: “We fully recognize that many of the evaluation statements we make contain a degree of subjective scientific perception and may contain much ‘community’ or ‘personal’ knowledge. For example, the very choice of model variables and model processes that are investigated are often based upon subjective judgment and experience of the modeling community.”
In that same report the IPCC further admits, “In climate research and modeling, we should realize that we are dealing with a coupled non-linear chaotic system, and therefore that the long-term prediction of future climate states is not possible.” Here, the IPCC openly acknowledges that its models should not be trusted. Still, the IPCC obviously needs to apply them to justify its budget and influence. Without contrived, frightening forecasts, they would soon be out of business.