Levels of atmospheric carbon dioxide constrain vegetation types and thus also non-biological uptake during rock weathering. That's the reasoning used to explain why CO2 levels did not fall below a certain point in the Miocene.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/climatic-plant-power
[2] http://admin.indiaenvironmentportal.org.in/category/author/yves-goddris
[3] http://admin.indiaenvironmentportal.org.in/category/author/yannick-donnadieu
[4] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-science
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/flora
