> But as Schleussner and his colleagues estimate, up to 400 gigatonnes of carbon would need to be removed from the atmosphere by 2100 to limit warming to 1.5 °C, assuming current emissions trajectories continue. In emissions terms, that is equivalent to running the US energy industry in reverse for around 80 years.

I'm not sure what the point is of even discussing something like this.

It is probably narrowly technically possible. But short of an alien intelligence appearing and forcing us to upend everything to stop all fossil fuel mining and build green infrastructure that only exists to sequester carbon, there is no way it will happen.