Water and the rivers that carry it are becoming increasingly prized. Our warming planet, increased droughts and burgeoning populations make control of water more and more important. And when there are disagreements, the fallout can be very serious. Pakistan and India have stopped bombing each other after short but intense fighting erupted in Kasmir last month. Now a potentially more catastrophic tension is building over a long-standing water sharing agreement. 

• Guest: Anupreeta Das - New York Times South Asia correspondent