Question: Will water replace gold someday as the next precious commodity? With the advancements in hydrogen cells and world water pollution, will clean pure water become so rare that we will start buying stock in it and trading it on the exchange? Is it the next hot commodity?

Answer: 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.
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