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Fact-checking the second volume of the U.S. National Climate Assessment

Fact-checking the second volume of the U.S. National Climate Assessment

This recently-issued study (the “Assessment”) was seized on by the media as proof of the massive damage the US will suffer if nothing is done about climate change. The Assessment’s conclusions are based largely on speculative model projections that aren’t amenable to checking, but it also claims that the US is already experiencing some of the impacts of man-made climate change, and these claims can be checked. This post accordingly evaluates them claim-by-claim and finds that they are rarely backed up by any hard data, that in some cases they are contradicted by disclaimers buried in the text, and that in no case is there any hard evidence that conclusively relates the impacts to man-made climate change. The credibility of the Assessment’s predictions can be judged accordingly.

The Assessment is 1,600 pages long and I doubt that anyone has read it from cover to cover – I certainly haven’t. I have obtained my information from the Summary Findings, Overview, Report Chapters and Downloads sections in the boxes that clicking on this linkleads to. These sections themselves contain several hundred pages of text, much of it repetitive, but there is always the possibility that I’ve missed some critical graphic or piece of text. On the other hand, if I’ve missed it the media, who will have read the introductory sections only, will have too.

And how did the media report the Assessment’s results? Here are some excerpts:


Climate change is already harming Americans’ lives with “substantial damages” set to occur as global temperatures threaten to surge beyond internationally agreed limits ……… The influence of climate change is being felt across the US with increases in disastrous wildfires in the west, flooding on the east coast, soil loss in the midwest and coastal erosion in Alaska

…click on the above link to read the rest of the article…

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