Also, please don't give Elon any ideas, he already has enough futile showboats.
Ignoring this reality will just guarantee our collapse. Geoengineering gives us a plausible way out.
The alternative is people continuing to clamor for global cooperation, a comically naive goal that has gained near to zero traction in 40 years.
We don't need to achieve "global cooperation". We just need to each act in our own self interest, as quickly as we can. It is the only strategy that can work. It still might not work. But directing resources elsewhere makes it happen slower. Too slow is the same as failure.