COMPUTING LAND-USE EMISSIONS OF GREENHOUSE GASES

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.