On a serious note, I hear you and agree with you to a certain extent.
Indulge me for a moment, in long run most likely universe will end up in heat death. So yes, we are screwed.
But right now, it's time for action. We need to think of engineering solutions.
There are 2 key problems here:
1. amount of CO2 in atmosphere
2. heat added by sun every day.
Fix any one of them and we stand a chance. There are ways of fixing it from accelerating photosynthesis (chemically or by optimizing plant growth by controlling env. it's growing in etc.) or having a sun shade at L1 or just literally planting more trees.
I am assuming you are a techie, so you are well equipped with tools and you are certainly not happy, so you have a motivation.
We may not be able to solve it perfectly we can certainly make a huge dent.