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Understanding how Agroforestry Systems Impact Green Water-Blue Water Dynamics

Today’s food production involves a consumptive water use of altogether 6800 km3/yr (out of which 1800 are supplied from blue water resources). To feed humanity by 2050 on 3000 kcal per person per day will require an additional 5600 km3/yr, out of which a maximum of 800 will come from blue water resources. The 2050 column shows that the remaining 4800 have to be contributed from new green water resources (e.g. horizontal expansion) or from turning evaporation into transpiration (Falkenmark et al., 1998). Because agroforestry systems contain all the major components of the green water category shown below, it is quite important to quantify the likely impacts of scaling up best bet agroforestry practices on green water-blue water dynamics.