Even disregarding climate change, we are way past the point where 8 billion people can survive without modern industry. The same will be true for geoengineering in the long term. Remember, we are still in an ice age.
Maybe it's time we all take a personal inventory of our own practices and how they impact the survival of our species, the planet's entire biosphere, before the next generation asks us, "why did you not change yourself to stop this?"
We’d easily choose all out war to keep our kids comfortable long before we’d all choose to lead smaller lives.
We’re not going to hold hands and sing while we all pedal bicycles and live in highly dense housing - we’ll give the army flamethrowers and they’ll keep out the wave of “climate refugees” until we’re fully out of anything we can make napalm out of.
You can't force people to care. That's the whole problem. Everyone thinks their contribution isn't the tipping point and someone else could make a bigger impact. People won't significantly change their habits unless they are forced to.