Water as vital to national security as defence - UN
* Shared rivers, aquifers face strains from more demand
* 145 countries share river basins with neighbours
* U.N. issues first definition of water security
By Environment Correspondent Alister Doyle Reuters March 22, 2013
OSLO - Stresses on water supplies aggravated by climate change are likely to cause more conflicts and water should be considered as vital to national security as defence, a United Nations report said on Friday.