Climate doubters lose one of their last remaining arguments
The United Nations’ Intergovernmental Panel on Climate Change is the keeper of the expert consensus on global warming, issuing a painstaking, authoritative report on the state of the science roughly every five years. The body released its sixth assessment on Monday. As with those before it, the latest appraisal was both alarming and unsurprising. Humans are warming the planet. This warming threatens civilization. The worst effects are avoidable, but the problem gets harder to address the longer world leaders wait.
This essential picture has not changed in decades. Yet scientists’ confidence has. Experts are...