[ftxbro]

Isn't it possible to radiate heat into space, like with a directional radiator? Or are you saying that it is possible to do that, but it's not possible to convert heat in the atmosphere into radiant heat that goes out of a radiator without somehow generating more heat that goes into the earth?

[SketchySeaBeast]

I didn't consider a directional radiators. Maybe that's more possible, but still you'd need to move a huge portion of what the sun is hitting the earth with and reflect it back into space.

Looks like the oceans have been heating at a rate of ~0.5 - 1 W / m2[1], and there's 3.61e+14 m2 of ocean on the planet, so potentially we'd need to radiate 361,000,000,000,000 W into space just to break even (assuming we're not generating heat to move the heat)?

[1] https://e360.yale.edu/features/how_long_can_oceans_continue_...