The International Water Management Institute had 500 scientists examine the water we use for agriculture.
Their report took five years to complete. It found that we will not have enough water to supply global demand for food during the next few decades unless urgent and substantial reforms in water and agriculture are undertaken. Climate change will create this situation more quickly and make it worse. The latest Intergovernmental Panel on Climate Change report says that if global average temperature rises by 3C, hundreds of millions of people will be exposed to increased water stress. It provides the wake-up call we all need to start acting on water.
Comprehensive Assessment of Water Management in Agriculture. 2007. Water for Food, Water for Life: A Comprehensive Assessment of Water Management in Agriculture. London: Earthscan, and Colombo: International Water Management Institute.