Talk:Carbon fixation

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are there any processes other that photosynthesis that fix carbon?

What about carbon fixation by marine animals and micro-organisms? There must be a lot of carbon locked permanently in chalk, limestone and marble. Is this process continuing, and if so, what proportion of anthropogenic carbon is being fixed in this way?

[edit] Carbon Fixation Processes

It would be helpful, I think, were all three of the Wikipedia articles on particular carbon fixation processes -- C3, C4 & CAM -- be placed together under this "Carbon Fixation" banner.

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