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The main purpose of the IMAGE Land Use Model is to show the user the relations between various land-use changes and agricultural processes, the trade-offs between and the impact of different strategies to control emissions related to land use. The major motive for land conversions is the demand for food, meat and dairy products, and feed. Part of this study involves functions of demand based on cross sections of the GNP and population for a large number of countries. The sources of greenhouse gases described in the Land Use Model are those related to land use changes, agriculture, landfills and natural sources: CO2 emissions from permanent and temporary conversions of forests to agricultural land and grasslands; N2O) emissions from natural ecosystems and agricultural systems; CH4 emissions from natural wetlands, wetland rice cultivation and landfills, and finally, CH4, CO and N2O) emissions associated with burning processes (burning of savannas, agricultural wastes and wildfires, shifting cultivation and other processes of forest burning).