Indeed

A rare moment of agreement with both Samuelson and Saunders: yes, it's going to be enormously difficult to reverse climate change.

That's why all we can hope to do in the foreseeable future is slow it down a bit and trust that in the future technologies will be available to drastically reduce CO2 emissions. However, pointing out the difficulties is no excuse not to take the first step in the long road to carbon emissions reduction.