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Earth System Dynamics An interactive open-access journal of the European Geosciences Union

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Earth Syst. Dynam., 5, 41-42, 2014
https://doi.org/10.5194/esd-5-41-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Peer-reviewed comment
28 Jan 2014
Comment on "Carbon farming in hot, dry coastal areas: an option for climate change mitigation" by Becker et al. (2013)
M. Heimann Max Planck Institute for Biogeochemistry, Hans-Knoell-Str. 10, 07745 Jena, Germany
Abstract. Becker et al. (2013) argue that an afforestation of 0.73 × 109 ha with Jatropha curcas plants would generate an additional terrestrial carbon sink of 4.3 PgC yr−1, enough to stabilise the atmospheric mixing ratio of carbon dioxide (CO2) at current levels. However, this is not consistent with the dynamics of the global carbon cycle. Using a well-established global carbon cycle model, the effect of adding such a hypothetical sink leads to a reduction of atmospheric CO2 levels in the year 2030 by 25 ppm compared to a reference scenario. However, the stabilisation of the atmospheric CO2 concentration requires a much larger additional sink or corresponding reduction of anthropogenic emissions.

Citation: Heimann, M.: Comment on "Carbon farming in hot, dry coastal areas: an option for climate change mitigation" by Becker et al. (2013), Earth Syst. Dynam., 5, 41-42, https://doi.org/10.5194/esd-5-41-2014, 2014.
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