sorry, I'm aware that climate change is a serious problem requiring decisive action, but could you explain exactly your claim that 'humanity is done for' by 2026? this sounds somewhat exaggerated and extraordinary claims require extraordinary evidence.
Only thing I disagree with on that blog is that the feedbacks will happen over a longer timeline. But 2026 is the tipping point year where climate change starts accelerating so fast it won't be able to be stopped. Then over the next 5-10 years things like "Clouds Tipping Point" (https://arctic-news.blogspot.com/p/clouds-feedback.html) will be reached. So 2026 is the beginning of the end of human civilization IMO. Of course some people may live underground, in the ocean or other places, but billions of people will die within 10 years following the 2026 tipping point. Billions is the low estimate, more like 99.999999% of humans.