What's to achieve by saying we've blown it - that people spark a revolution, or give up trying ? Some of us have been trying for decades, others have been denying for decades, doubt either set gives up.

I completely agree. In my case, I trusted that it would be dealt with like leaded gasoline, the ozone layer, etc. Then the late 2010s happened and Trump, Johnson, Bolsonaro, and other climate denying fascista/uthoritarians in mass gained power and the things warned about started happening.

I do what I can, and try to convince others to do what they can. Individual actions add up, but at least in the US we need a major infrastructure, culture, and urban design overhaul. That requires persuading people.