To calculate the net effect of NT farming on radiative forcing, we need to consider jointly the emissions and removals of all the GHGs (Robertson and Grace, 2004; Mosier et al., 2005). To allow for differences in radiative forcing, all gases are expressed as CO2 equivalents (CO2e), assuming that N2O has a 100-year GWP of 296 (i.e. 1 kg of N2O has the same radiative forcing as 296 kg of CO2) and CH4 has a GWP of 23 (IPCC, 2001). Rather than describe generalized trends, we consider a specific example to illustrate the processes to be considered. Before proceeding to that example, however, there is another complicating factor that deserves mention - the issue of time.
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