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Interannual variations of global warming potential (Pg CO2 eq/year) for CO2 (a), CH4 (b), N2O (c) and their overall fluxes (c) during 1979–2010. Note Positive values indicate a potential net contribution to climate warming; the data was based on our previous publications (i.e., Tian et al. 2010; Xu et al. 2010, 2012)
