The Earth has been getting warmer — but how much of that heat is due to greenhouse gas emissions and how much is due to natural causes? A leaked report by a United Nations’ group dedicated to climate studies says that heat from the sun may play a larger role than previously thought.
While the IPCC settled on 3C per doubling of CO2, it strongly implied that all the risk was to the upside, and many other prominent folks who typically get fawning attention in the media have proposed much higher numbers.
NY Times climate writer Andy Revkin has quite an article recently, finally acknowledging in the paper of record that maybe those skeptics who have argued for a lower sensitivity number kind of sort of have a point.
“Worse than we thought” has been one of the most durable phrases lately among those pushing for urgent action to stem the buildup of greenhouse gases linked to global warming.
But on one critically important metric — how hot the planet will get from a doubling of the pre-industrial concentration of greenhouse gases, a k a “climate sensitivity” — some climate researchers with substantial publication records are shifting toward the lower end of the warming spectrum.
By the way, this is the only metric that matters. All the other BS about “climate change” and “dirty weather” are meaningless without warming. CO2 cannot change the climate or raise sea levels or any of that other stuff by any mechanism we understand or that has even been postulated, except via warming.