It's an absolutely giant, complex system that has enough opportunities in the works for humans - or groups of humans running corporations/NGOs/research groups - to exploit for personal profit/power/etc. meaning the end-goals are never truly achieved.
You have no recourse to your government for the decisions it makes - sure, you can vote - but your vote has such little power compared to the effort required to make meaningful decisions in society at large. Violence is out of the question legally, though the government sure likes to be violent towards its people when they want something from you.
I believe it's simply not possible for the government to simultaneously keep and grow its power and take complete care of its citizens. Governments are corporations with customers that are forced to buy products (road access, schooling, healthcare, as some examples) from them at the rate the government chooses at the service level they choose. You have no other options. Good luck with trying to change it when there's so many people all fighting amongst each other over inane things compared to this all-encompassing problem of the climate, like 'critical race theory', 'universal basic income', or 'building a wall'.
If we've already gone past the turning point as you have suggested with credible evidence, then why bother pushing so hard? We've already ruined the earth. Why not make things as comfortable as we can for the ones that are still around?
Bit of a defeatist attitude to take, but it seems like that's where it's going to inevitably if the climate scientists are right.
I don't know - I'd rather live in relative comfort because I owe nothing to the people of the future, and I wouldn't expect people in the past to owe me anything either...
Can you not see? The changes became so rapid in the last few years that you can just go outside and see for yourself, extreme temperatures, heat domes, cold waves, wildfires, droughts, intense storms, vanishing biodiversity. Once in a hundred years events one after another. I remember my childhood when we used to have four seasons, we barely have two now, a mild winter with occasional cold waves and a summer with extreme weather. No in-between. Biggest droughts we have ever seen. A lot of insects missing.