Suppose there's zillions of tons of CO2 in the atmosphere of a planet and summer temperatures become unbearable. The amount of CO2 is so big it cannot be removed anymore, or it would become an endless effort.
What could a hypothetical technologically advanced civilization on a planet do, to cause release of all that heat in the atmosphere selectively, that is to occur only during the wet and winter seasons ?
(This question is not science based and the civilization is near future SF, imagine a few hundred years, on Earth or on a similar colonized planet that requires terraforming. No magic. Frame challenges are welcome)
Notes on comments below:
Indeed, I want to know how an advanced civilization with a world under a major greenhouse effect would cool down their world during the summer.
Southern and northern hemisphere on this planet have opposite seasons, as a result of axial tilt.
Also, comments have pointed out this idea is very location-specific. Southern and northern hemisphere have alternating seasons. I now wonder if some region with lowered CO2 concentration could be established, where the low concentration persists during summer. Then, this region with lower concentration of greenhouse gasses migrates (in some way) to the other hemisphere, to stay there for another half year. Arrange some kind of cycle in the atmosphere..