Each country has their own issues and means of deciding how they respond whether its technology , taxes or whatever , all have a role to pay , individuals , community m government and the like.
I am far more positive about the future than you obviously are and much of the press and reports and modelling you base your fear on is an understanding of how the climate behaves to change and what COULD HAPPEN as you allude to.
I remember as a child when they wrote off the Great Barrier Reef due to excessive bleaching and natural enemies like the crown of thorn I only used Y2K not as a comparison to climate change but how fear dictates not only a negative response but also a positive response.
The reef is in the best shape it has been for 50 years now.
As for your other predictions we already have those in abundance such as extreme weather , migration , starvation and unprecedented levels of unemployment through out history well before climate scientists started the dialogue on global warming.
C02 is critical for life without it you wouldn't be on this planet , climate change is an issue but I can assure you it won't be the reason humans become extinct on this planet in their billions.
As for the pandemic cast your mind back hundred years when 500 million from a population of 1.8 blillion became infected and killed 50 million in relatively quick time.
I do agree with you when you say your view on mass destruction on a global scale is inevitable if we don't reverse global warming is depressing.
Just do your bit my boy and reduce your own footprint but don't rely on governments throughout the world to act as one as China and India and other developing countries increase their C02 emissions in the years and decades to come.
For 50 years the UN have been saying we have 10 years or so to reverse the trend or its the end of humanity as we know it.
they remind me a lot like the WHO was said early on masks don't matter when it comes to the spread of covid , their is no pandemic and it didn't come from China or a lab and its fine to continue to get on a plane and be a global citizen before a change of heart some months later when it became obvious they were somewhat off the mark.
I know chippy boy's descendants and mine will have a much better life and opportunity to fulfil their lives ambitions and a longer life in fact than me and my ancestors had.
Don't depress yourself over this , you can be a glass half full person when it comes to climate change.
If City lose their first ten games I will start to think of the R word again (LOL) but life is full of unexpected outcomes and very unpredictable just ask the climate scientists and health bureaucrats whose decisions have driven the response to covid.