There is no practical way we can achieve the goal of survival through reduction of CO2 emissions. It's a farce because we'll never get all parties to agree.
The only path forward is to hope we have some very clever science and engineering that can help us survive this disaster.
It's a farce because it's already too late for emissions reductions to cut it. We need to pull carbon out of the atmosphere or, as you say, engineer other solutions.
But a robust solution is not going to be limited to the physical/material domain. Societies are malleable and so are people. We need to design ourselves and our activities into a vibrant planetary ecology, not throw up our hands and try to patch around historically contingent circumstances
As Octavia Butler put it, God is change, and change is not to be reacted to, but to be shaped