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We could reverse this statement, but replace "water" with "warm clothing". It's not like we haven't been ameliorating the effects of cold for ages.

No, you're saying that like those extreme highs are distant specters. They already happen and are part of our immediate future. At which point, the human body cannot survive by evaporating water. Drinking cold water is an active measure which frankly is not available to all people, especially many of those most vulnerable to these fatal temperatures. When the WBT passes a certain level it will kill you straight up. Cold, not so much. People live in Antarctica. And although we will get storms and more extreme weather, the planet is getting hotter.

Also, AC uses way less carbon than heat.

Heat pumps can work both ways.

> you can survive heat as long as you have a supply of water

Above ~55C (131F) that water will burn your tongue and throat. Even at 45C water will be uncomfortably warm.

What are you talking about?

A majority of the world's population is into drinking tea and other beverages significantly hotter than 55C