The Economist.com reported that trading water would help alleviate water shortages.   With water consumption doubling every 20 years, according to Goldman Sachs, lack of water could prove to be a bigger threat to mankind than rising food prices or the depletion of energy resources. 

Goldman expects profits to be "made less from selling the stuff directly, and more from investments in infrastructure and new technology. The bank estimates that America alone needs to spend around … Read the rest