The Coming Water Wars?

Jack Shafer and Wendy Barnaby don't buy it:

None of my skepticism should imply that I think everybody everywhere has all the clean, cheap water they need. Water, like all resources, is scarce, and I accept that scarcity can cause conflict. But before anyone starts frightening themselves about impending water wars, they might want to consider Barnaby's observation that in the last five decades there have been no "formal declarations of war over water."