What I wanted to say is this: drastic reduction of greenhouse gases  is possible if it is necessary. If the global climatic balance is really "tipping over" the pain from severe rationing and other emergency measures to reduce oil, gas and coal use is smaller than the consequences for not doing that.

If we have some time left, energy depletion will do the trick in 30 years or so. ASPO scenario shows an imminent peak of oil, NGLs and natural gas. It is quite likely that coal production cannot increase much in the future. Coal peak is likely in 30 years time. No Tokyo II is needed. Depletion will do it much better. But if we are really in an emergency, other kind of solutions are needed. This is the big question.

They also built over a million civilian gasifiers because the military used up the gasoline.

http://www.woodgas.com/history.htm