The IPCC has published a new generation of climate scenarios – and buried in the fine print is a remarkable concession: the extreme warming pathways that dominated climate research, policy, and media coverage for decades were never actually plausible. It took a while to notice because almost no one in mainstream media bothered to report it. “The Intergovernmental Panel on Climate Change (IPCC) has just published the next generation of climate scenarios,” Science policy analyst Roger Pielke Jr. wrote, calling it “big news” that “eliminated the most extreme scenarios that have dominated climate research over much of the past several...