[dvdkhlng]

The right way to look at extreme weather events in the climate change context is via Attribtion Science. Stated simplistically this looks at "how often would these kind of extremes happen in a world with normal normal levels of CO2" vs. "how often would they happen at current human-caused CO2 levels". If a certain extreme of heat-wave happens once every 10 years now, but would only happen once every 1000 years without human-contributed athmospheric CO2, than wouldn't that justify calling the extreme weather event in question as likely human-made?

Of course that depends on the availability of accurate climate models for the event in question.

Here is a non-paywalled text on the subject:

https://www.stat.berkeley.edu/~aldous/157/Papers/extreme_wea...