system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If the planet is getting too warm, but space is freezing cold, why can't we just "vent" some excess heat into space?

Edit: Thanks for all your replies, this has been enlightening. I think we can close this post now though, there are only so many ways to explain the issue and I think I understand now :D.
gpt
That's basically what the greenhouse effect prevents from happening. 

Earth emits light (which carries some energy) away. However, more of this is getting trapped by CO2 in the atmosphere and, thus, less heat is getting transferred to space.

Beyond ensuring there are fewer greenhouse gases in the atmosphere, there's not much we can really do to control how much light the Earth radiates into space and there isn't really another mechanism by which the Earth, as a system, loses much energy.