Contradictory Contrarian Claims, Part 4 - Confusing Local with Global Mean Temperatures
On September 6 , Matthew Wielicki posted a claim on X that global warming isn't a problem because 2°C warming by 2100 is "about the temperature change from 8am to 10am in most major cities." He then showed a graph of expected temperature changes from 8 am to10 am, from sunrise to afternoon, January to July, etc for various cities. I think it's fairly easy to show that Wielicki is being dishonest here, since he also flatly contradicts this claim. But before showing him contradicting this claim, let's explain Wielicki's horrible logic. In effect, he's making the simple mistake of confusing local diurnal and seasonal temperature changes with global climate change. When the global mean becomes 2°C warmer, the distribution of temperatures locally and globally also changes, making what used to be extreme heat far more common. In another post, I document that there has been a 220x increase in frequency of extreme summer heat in NH land temperatures with respect...