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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 wellestablished
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.
