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Why I like winter. I can always add more layers. However, in the summer, you can only remove so many layers until it becomes a crime.

And being naked would not help much, or would make it even worse, depending on how sunny it is.

Thank you for making me imagine sunburn in some really uncomfortable areas.

Removing that last layer doesn't gain you all that much in high humidity conditions, and in some situations it's going to cause you sun protection issues.

Gas or chemically powered personal air conditioners may become more common. Of course this solves the problem for the individual while worsening it for the planet/society.

Edit: At 500 watts, you could combine your personal cooler with a solar panel. The system would be 2-3000 dollars. A bit more than a parka but less than a car.

That's without wind chill?

Yeah. Wind chill is a difficult measure to use. Varies a lot, you make wind when you ski fast, it really only affects exposed skin which you don't have at this temp.