ABSTRACT
The agricultural contribution to global non-CO2 greenhouse gas emissions is estimated to have been 5.1–6.1Gt CO2-equivalents (eq) per year in 2005. That is 10–12 per cent of the total global anthropogenic emission of greenhouse gases (Smith et al, 2007). The dominant gases emitted in agriculture are CH4 and N2O, contributing to about 47 per cent and 58 per cent of global anthropogenic emissions of CH4 and N2O, respectively. According to the IPCC, the main sources of agricultural emissions are soils (38 per cent), enteric fermentation (32 per cent), biomass burning (12 per cent), rice production (11 per cent) and manure handling (7 per cent) (Smith et al, 2007).
