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agumonkey

Fair point, it's blurry

From the top of my head, most cited ones are

Concrete production

Heating / cooling (unless designed to be physically smart)

Beef production

Worldwide transportation (fruits all year long)

Cars

If you eat a Mediterranean die, move by foot or bike and have a well insulated house with no AC you're good

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Why pick on AC? How about adding no heat?

Heat is necessary, AC is not necessary (I realize this is not entirely true, but I think it's fair to say a lot more people would die without heat than without AC).

Living in inhospitable environments is a choice, not a necessity, that is causing environmental degradation. Let’s say an ideal human environment temp is around 60-80 degrees. In 110° weather, you just need to move 30°. In freezing weather you’ve gotta move 48°. That’s 50% more delta.

I think trying to fit the populations of North America, Europe, Russia, China, Japan, Korea, the Stans, Mongolia, the Baltics, New Zealand, Chile, and Argentina, not to mention alpine countries like Nepal, into the ideal human habitability zone would go poorly.

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