Lester Brown, head of the Earth Policy Institute think tank in Washington, is concerned that declining water supplies combined with the push for water-intensive biofuels could be a threat to global food security. Another Reuters story reports: "The thing to keep in mind is that it takes 1,000 tons of water to produce one ton of grain.... Seventy percent of all the water we use in the world – that we pump from underground or divert from rivers – is used in irrigation. Not everyone has connected the dots to see that a future of water shortages will be a future of food shortages."

(in Portuguese) Falta de água, alimentos e energia causaria guerras e imigração em massa.