The thing that bugs me about these "worst x since y year" articles is that the metrics are always so arbitrary. In this case, their definition of "worst heatwave" seems to be "Tokyo charted temperatures above 35C on Wednesday for a fifth straight day." Just wait until next year when the new metric is "Tokyo charted temperatures above 37C for 3 days". Also Tokyo != Japan!

Grumbling aside, I do welcome articles that bring attention to climate change issues, but they should really come with the caveat that climate change is about much more than just the ambient temperature.