Notill Farming The Net Result

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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