In the Seattle PI this morning there is a great article on water. Please read it if you have time. From reading it I think you will gather that water is soon to be the most powerful political tool in the entire world even taking over oil and energy concerns.
Some facts mentioned in the article.
In Russia it takes 29,000 gallons of water,(flood irrigation) to produce 1 pound of cotton.
That between 5,000 and 10,000 children die each day world wide from bad water.
There is a lot more interesting info in the article, lot's on what is happening in the western USA, please read.
Sorry I can not get a direct link to the article.