Memorandum on the U.S. Environmental Protection Agency’s Advanced Notice of Proposed Rulemaking for Greenhouse Gases

Scientific understanding about the Earth’s climate is tentative at best. As a result of uncertainties over what causes climate to change and how and when, there are rival theories and arguments among scientists about how to interpret the evidence.
 
Rather than join these arguments, we have examined the processes that have been used to analyze the available data in order to derive forecasts of climate over the 21st Century. We have concluded that the forecasting process reported on by the Intergovernmental Panel on Climate Change (IPCC) lacks a scientific basis.