Is Global Warming Causing Massive Heatwaves?

 During the past century the Earth has warmed by roughly 1°C and human emissions could have contributed much to the warming.

El Nino periods contribute to temporary warming, and local warming due to urbanization is also important.

There is no convincing evidence that the atmosphere becomes wavier under global warming.

With the general temperature of the planet slowly rising from human greenhouse gas emissions, the heatwaves should be about 1C warmer and cold waves about 1C weaker.

By the way, extreme cold kills FAR more people each year than heatwaves, so global warming is actually reducing deaths from extreme temperatures.

Would we have had major heatwaves without human-caused global warming?

Were the heatwaves this week enhanced modestly by global warming.

So even if there was no global warming going on, Phoenix's temperature would have substantially increased over time due to the rapid development of the city.

Such urban heat island effects seriously degrade the temperature records, producing artificial warming.

Finally, let me note that although the Earth is slowly warming from human-induced greenhouse warming, there is no evidence that heat waves are being amplified or enhanced over this base warming.

Annual high temperatures have gone up about 2F, roughly the same as the global warming signal. 

https://wattsupwiththat.com/2023/07/20/is-global-warming-causing-massive-heatwaves/