Is there a critical global temperature rise at which the biosphere will switch from being a net sink of CO2 to being a net source?

Current plans to mitigate climate change assume that reducing anthropogenic emissions of CO2 will eventually stop the increase in atmospheric concentrations. There is concern, however, that rising temperatures could trigger changes in the biosphere such that the biosphere becomes a net source. If such a critical temperature exists, exceding it would have catastrophic consequences.

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