We cant scale carbon capture large enough yet. We would also need to completely overhaul the electrical grids but we don't yet have the battery capacity to sustain renewables. This would have had to start a decade ago and the technology just was not there yet.

I am sure if the world united together and invested everything into this it would be possibe. But Russia, China and India dont really give a damn about climate change right now.

No it shouldn’t be brought up even in the slightest. The man should be held accountable for his decisions.