The worst aspect of CO2 fertilization is that it results in plants of relatively low quality -- richer in carbohydrate (which is where the carbon goes), but poorer in nitrogen and other nutrients. THIS IS BAD. However, the increased sum of biomass is generally good.
One of my ideas (now going on 10 years old) for mitigating the effects of climate change is to increase soil nutrients to complement the CO2. In other words, to optimize the potentially-good effects of CO2. It is actually not a new idea. A guy named Hamaker (sp?) proposed it in the early 80s. His focus was on massive use of rock dust as a soil fertility-builder, to stimulate plant growth which in turn pulls CO2 out of the air. It was a good idea. The only way my idea differs is that I would like to see more of a focus on nitrogen, and this can be done easily by propagating (N-fixing) legumes. But the basic bottom-line idea is the same: increase soil quality, thereby optimizing plant growth, and (hopefully) increasing the "pull" of CO2 out of the atmosphere.
PS: Agelbert: if you censor another one of my posts, then I really am out of here forever. If that is what you want, then go for it.
Agelbert Responds: Your post discusses a laudable, but paltry and insufficient measure which will not ameliorate the existential threat. I read your posts on soil nutrients 3 years ago and agreed. That is a great idea. But it won't stop climate catastrophe, which is the subject of this debate.