What if carbon oxides are huge buffering agents

You mean they aren't ? Not according to our polys - "who belives polys esp the  ones who talk market but distrust business ?"? The media seem to - strange allegiance - how long can it last ?
As for the basic chemistry controls ( there are a few others but here is one )
While the concentration of carbon dioxide in the atmosphere remains the rate limiting factor for photosynthesis, and nearly every leaf on the planet provides evidence of that , I see no reason to worry too much about the very low levels of carbon dioxide  in the atmosphere.
Even Lomborg may have to get used to the idea that his welcome focus on the real issue of alternative energy sources ( rather than Co2) is publicly to lose its biggest driver . 
The eco point is that no civilization will survive change if it mistakenly perceives a threat let alone quickfixes it ( as he is saying most so called responsive governments have done in the last  20 years ) The true focus of all effective sustainability action is that it anticipates the truth - and is not distracted by quickfiz