Climate Change Reconsidered II: Summary for Policymakers

Many scientists, policymakers, and engaged citizens have become concerned over the possibility that man-made greenhouse gas emissions, in particular carbon dioxide (CO2), may be causing dangerous climate change. A primary reason for this public alarm is a series of reports issued by the United Nations’ Intergovernmental Panel on Climate Change (IPCC). The IPCC claims to know, apparently with rising certainty over time, that “most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations.” This Summary for Policymakers summarizes and interprets a major scientific report that refutes this claim.

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