Dramatic reductions in water levels could lead to conflict. Will legal and diplomatic policies help countries to cooperate?
Ilmas Futehally in Mumbai
Fifty years ago, Lake Chad in Africa had a surface area of 25,000 square kilometres. Today, it has less than 2,000. The surface area of the Aral Sea in central Asia has dropped by half, from 66,000 to 33,000 square km, and the Dead Sea in the Middle East from almost 1,000 to 650 square km.