alt Hacker News> climate simply hasn’t, until recently, required it.
I would qualify that as it hasn't required it since the invention of air conditioning.
Which also isn't strictly true; the high temperature for Paris on July 1st this year is identical to the high for the same day back in 2015[1], and there are several times since 1970 that the temperature was over 30C.
Other sources[2] indicate 1947 was just as brutal as 2019 and 2022, and the warmest night was in 1772 (27.5C)
[1] https://weatheronthisday.com/intl/paris/7/1
[2] https://en.wikipedia.org/wiki/Climate_of_Paris (standard Wikipedia reliability warning applies)
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Yes, there have been hot days across northern Europe before; however, the frequency of very hot weather has increased substantially.
It may not have gotten the headlines of this year’s heatwave, but we were in Switzerland and Germany for a month last July. For three of those four weeks, it was stinking hot. The maximum temperatures weren’t so bad, but the nights were oppressive, and there was no letup. If that’s going to be the norm most summers, it absolutely justifies investing in air conditioning.
Outside air temperature isn't an issue. It's not like people drop dead the moment it hits 40. The problem is that after a few days of that everything is heated up through and you have no place to escape it. That's new and hasn't been happening before.