[adrianN]

You can look up the carbon cycle on Wikipedia, it is fairly well understood where atmospheric carbon can go. Most processes that sequester carbon long term take geological time spans. So unless you think we engineer sequestration at a rate comparable to what we emit today, atmospheric carbon is here to stay for a really long time. Personally I think we won’t be able to scale sequestration technology sufficiently in the next decades to make a dent in the carbon levels.

[holowoodman]

Carbon sequestration through plant-life seems to increase more than expected with rising atmospheric CO_2 levels. We are currently seeing increased global plant mass.