Working Group (WG) I’s Contribution to the IPCC’s Fourth Assessment Report (AR4): A Critique

This report reviews and critiques the findings contained in the Summary for Policymakers (SPM) of Working Group (WG) I’s contribution to the Intergovernmental Panel on Climate Change (IPCC)’s Fourth Assessment Report (AR4) that are likely to attract the most attention. It draws on material from the final draft of the underlying WG I report and scientific literature that was either not considered or not given sufficient weight by WG I.

The Marshall Institute is commenting on eight findings in the WG I SPM which are most likely to receive the most attention. These findings, presented in the order in which they appear in the SPM, and our evaluation of them are summarized in the table on the following page.

Overall, it is clear that many of WG I’s findings are not supported by their underlying report and are unduly alarmist.

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