Reduction in the uncertainty of CH4 emissions could be achieved with better information on the emission factors for enteric fermentation in cattle and sheep.
Disaggregating cattle and sheep,
based on breed or how they are managed should lead to emission factors with improved precision and smaller uncertainty.
This is likely to lead to increases in the uncertainties in the activity data,
however, and so we must be cautious in our approach.
This argument also applies when we disaggregate the activity data used to
estimate N2O emissions, but because the uncertainties in the emission factors for CH4 are smaller than those for N2O emissions, it is more of an issue for CH4 estimates.