The world will not end it will change, does change. Humanity might peter out and go away completely or not. Whatever happens will it will take time and be unpredictable.

You wrote "The end of the world is our fault, an nobody else’s." Yeah, but for most of us our contribution to the destruction of humanity was tiny. We are each only one ten billionth of the problem. Most of the people who did the worst damage are already dead or will be soon.