A model has been developed to estimate the regional emission of greenh
ouse gases from land-use related sources. Driving forces for this mode
l are the changing regional demand for food and wood products driven b
y demographic and economic developments (Zuidema et al., 1994). To inc
lude the environmental conditions, which are essential factors determi
ning the flux for certain sources, emissions are grid-based where poss
ible. Grid-based explicit calculations are given for CH4 emission from
rice, wetlands. emissions from deforestation, savanna burning and agr
icultural waste burning and N2O from natural soils, arable lands and d
eforestation. For a number of sources (landfills, domestic sewage trea
tment, termites, methane hydrates and aquatic sources) geographically
explicit calculations are not yet possible because of data limitations
. For most of the sources the global results of the calculations are i
n agreement with other scenario studies, although there are difference
s for a number of individual sources.