[fuzzfactor]

>Is that a sort of joke?

Yes!

But only if your name is Roger :)

>you cannot make the land cold with air condition. You can just move heat around, with AC from the inside to the outside, but that costs extra energy -> more heat

Which is exactly what I've been saying since I was a teenager.

According to thermodynamics anyway . . .

[LamaOfRuin]

This is still just moving the heat around, but with metamaterials you can now passively convert the heat energy into wavelengths that do not get absorbed by the atmosphere and beam a decent chunk of it back into space.

[quinndexter]

I would like to know more.

[LamaOfRuin]

https://en.wikipedia.org/wiki/Passive_daytime_radiative_cool...