Should government in California take out the dam in Hetch Hetchy or keep it there?

Many environmentalist groups suggest the dam in hetch hetchy is environmental unfriendly. If we do take out the dam, where will cities like San Francisco get their water at? Any ideas for helping hetch hetchy improve its environment, while at the same time keeping the dam? Or is there such thing as a eco-friendly dam (powered by solar energy).



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