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I think people are misunderstanding the risk that is being refered to by the clock:

"Climate change, and the American government's attitude to it, is also cited in the report. While last year's Paris agreement on emissions controls proved hopeful, the fact that one of the world's largest polluters now disputes the effects of carbon dioxide and other greenhouse gases is giving the scientists serious cause for concern."

Their cause for concern is the massive risk to the billions of dollars of taxpayer funding for their gravy train...