I've "assessed" nothing of the sort. What I did say is that the human contribution to the amount of gases being added to the atmosphere by natural sources is negligible and temporary, and their impact remains to be conclusively proven.
The size of this planet and the volume of its atmosphere are very fast. Humans do produce CO2, but there are natural processes that absorb it, and human contribution to the absorption elements is a lot more significant and also more permanent. We irrigate, we fertilize, and we plant.
The burden of proof is on the alarmists to justify the "moral imperative" for the aggression they want to institute to "fight Global Warming", which would have to include fundamental homogenization of international law to severely limit what has historically been the greatest enabler of human liberty and achievement - intergovernmental competition. Appeals to authority and popularity do not constitute proof! Alleged global consequences of human activity have not been monitored with sufficient accuracy, other factors have not been sufficiently understood to be excluded, etc. The political motivations of the alarmists are clear, the actual climate evidence is not.