"Water researchers, policymakers, negotiators, scientists and environmentalists on both sides of water conflict tend to be in agreement: Tension over water runs high but war on a global front is highly unlikely. These water experts are unique in the tendency to sidestep conflict in favor of compromise."

I'm not so sure. Mankind doesn't seem to be too good on compromising when resources are limited (i.e. oil.) Why would we expect things be any different regarding water?