I have said consistently, and I stand by it now, that if the global warming wienies were actually right, the effect would be irreversible by this point.
If you buy into the fundamental premise of 'Anthropogenic Glocal Warming Climate Change,' there are three hundred years of momentum behind the Industrial Revolution, and that cumulative effect CANNOT be reversed by anything short of about a 90% depopulation of Earth ("Women, minorities most affected").
Ergo, we should say 'screw it' and pursue a sound energy policy based on renewable supply instead of worrying about emissions. After all, if fossil fuels are all going to be consumed sooner or later, won't the net inputs to the atmosphere from them be the same either way?