[How did plants adapated to past CO2 levels? Why won't they do it again?](https://earthscience.stackexchange.com/questions/7627/how-did-plants-adapt-to-small-sfco-2-levels-past-400k-years-why-wont-they/15852#15852)

**Upgraded:** 
i know i did that artistic trick about pigs (Portugal, Italy, Greece, Spain), but well i am not a bad guy.
i received a positive at least. Well it is something for human resources. i will probably do not answer a lot more anyhow. My geology is being forbiden, four years since graduation and i only read machine learning system and so now. i found it was strange, because i have studied a bit of Paleoclimate at EPOC, Bordeaux, and that is what happens. i don't know if the english is poor in this one too. This one may need edition too.

**Original after deleting some uncomprensible things i wrote maniatic** i think it is my best answer ever, even it is biology stack related,but ES are multidisciplinar.
i am thinking on studing a bit the topic, and give a more accurated answer, as i was a bit K stratego being posted at the excelent Pleistocene Hammen's answer, that didn't answer the question this time. He is surely bussy and he should write very quickly to profite his time at the site.

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