text: Yes, but not due to hydrogen cells or pollution. Mainly it's increasing population pressure that will make water more valuable. I don't think that we'll reach the point of actually trading water like gold, but there are stocks which are sensitive to the demand for water. Powershares has a new "Water resources" ETF which tracks companies that provide the equipment to develop water resources: PHO. It was doing well for a while, until the recent market correction. Now it's back to its price about 5 months ago.