Deforestation can also exacerbate food insecurity, as forests provide food, inputs and services that support crop and livestock production (Food and Agriculture Organization of the United Nations, 2006). In a case-study analysis of seven developing countries, Berry, Olson and Campbell, (2003) estimated that problems of sustainable land management reduced agricultural GDP by between 3 and 7 per cent. Poor people are likely to be farming steeper land and drier, less fertile soils and in more remote areas (World Bank, 2003).