How soon can we use the oceans to quench the world's thirst?

Which each passing year, the world gets thirstier. As the human population continues to grow, and becomes more urbanized, our sources of drinkable water get pushed to their limits. The solution? Desalination — the process of removing salt from ocean water. But given the tremendous costs and energy requirements of… » 8/24/12 11:30am 8/24/12 11:30am