The problem is that no one wants to willingly sacrifice their own wants or needs for the greater good, which makes sense. Why should I suffer for 8 billion people I don't know? The scale is just too large to comprehend as a basic human.
We need to focus on fixing our local area and living as much within what it can provide as we can. It's easier to understand. It's easier to see the impacts.
But it doesn't solve the problem of human caused climate change.
Maybe I'm too pessimistic, but I don't see a way out of this that ends with anything but the complete and utter collapse of civilization as we know it before 2100.
I believe that we will no longer possess the technology to access this comment well before that time, and we'll see a return to feudal/tribal lifestyles with a much diminished population.
I just hope it happens after my bloodline has already died out, and none of my kids or grandkids will have to experience the shit show. But I have little faith of that. I think the collapse will come within my kids' lifetime, and that's very depressing.