Satisfying future water demands for agriculture

摘要: The global demand for water in agriculture will increase over time with increasing population, rising incomes, and changes dietary preferences. Increasing demands by industrial urban users, the environment intensify competition. At same time, scarcity is several important agricultural areas. We explore pathways ensuring that sufficient food produced future, while also protecting reducing poverty. examine four sets of scenarios vary their focus on investments rainfed irrigation, role international trade adjusting national disparities endowments. Rainfed holds considerable potential but requires adequate mechanisms to reduce inherent risks. Irrigation expansion warranted places where infrastructure underinvested such as sub-Saharan Africa. In South Asia scope improving irrigation performance productivity high. International can help alleviate problems water-scarce areas, subject economic political considerations. a regionally optimized scenario combines irrigated strategic decisions. Compared ‘business usual’, this reduces amount additional required meet 2050 80%. Some could be made available other sectors. conclude there are land resources satisfy during next 50 years, only if managed more effectively agriculture.