What I mean that building a system to radiate radiate energy into space from the surface of the earth isn't very cost effective, and it's undoubtedly far less e

What I mean that building a system to radiate radiate energy into space from the surface of the earth isn't very cost effective, and it's undoubtedly far less expensive than building a system you would launch into space. The actual surface of the earth has the advantage of being able to use the whole surface of the earth. On earth you can use things like fans and evaporative cooling. It's far superior to making huge space radiators, but nothing is free.