Well, part of the argument you refer to is based in the idea that there may not be enough fossil fuels to continue at the rates that some of the energy scenarios project. However, those IPCC scenarios may also fail because the leave out the possible last desperate gasp and grasp for the remaining fossil fuels of some really damaging short-term scenarios.

Cutting down forests for wood fuel has a carbon impact that compares with fossil fuels and the IPCC scenarios don't really take any of that into account. Trying to convert cellulose to alcohol or coal-to-liquids also may be a real problem.

In an energy short world, global warming could end up being the gift that keeps on giving.