For reasons explained in my geoengineering papers, CO2 emissions control is unlikely to be effective in controlling global warming and useless for global cooling. For a comparatively modest cost, however, we could acquire the capability to carry out stratospheric geoengineering. Chances are very good that it would not be advisable to actually use it, but acquiring the capability would appear to be a wise precaution. It might also reassure those who believe in the UN hypothesis that possible potential warming could be stopped if there should ever be agreement that something needed to be done.

So in summary, I believe that significant global warming is unlikely this century, particularly as a result of increasing CO2 levels, but if it should start to occur it might be useful to be prepared to deal with such warming or the slightly more likely global cooling if necessary through stratospheric geoengineering. One other advantage of being prepared to use effective geoengineering techniques is that we would no longer have any need to undertake extremely expensive efforts to reduce CO2 emissions on the chance that there might be damaging global temperature increases or other adverse effects until the effects actually started to occur.