In many industrialized countries, self-reported national inventories are, on average, estimated to have uncertainties of less than 5 percent for national CO2 emissions from fossil fuel use.
Sa maraming mga industriyalisadong bansa, pambansa inventories self-iniulat na, sa karaniwan, tinatayang may uncertainties ng mas mababa sa 5 porsiyento para sa pambansang CO 2 emissions mula sa paggamit ng fossil fuel.