This article is very one-sided, at least. The carbon feedback is taken into account in climate models. We knew that the fraction of emitted CO2 that is taken up by the vegetation (world-wide) would decline.
Please do not be a climate “sceptic” of the other side. If there were a scientific revolution (and the exaggerated claim of run-away climate change certainly is) you would hear it from a large science organizations and not from some quotes and articles a political blogger gathered.
Joe Romm, please stick to writing stuff you know about, the energy transformation and climate solutions.