And water wars aren't an apocalyptic vision of the future. They're already starting to happen, the protesters say.

For farmers and fishermen whose river is about to be dammed, or a rural resident who sees his town overrun by tens of thousands of new housing units in the space of a few years, water is a fighting issue.

The concept of battles breaking out in the future over shrinking water supplies is gaining credence. Loic Fauchon, president of the nongovernmental World Water Council, and a co-chair of the official water forum, has proposed the creation of a peacekeeping force to solve water conflicts as they erupt around the world.

http://news.yahoo.com/s/ap/20060317/ap_on_re_la_am_ca/mexico_world_water_forum

[ Too many people. But it's profitable to have more. And when water wars start, security is an added-value service that can be sold. ]