Can someone answer Aing's question about desal of sea water vs desal of saline ground water?

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Is desalination of seawater considered more economically viable or 'sustainable' than desalination of saline ground water, given that the second method may also aid in alleviating salinity? If you have some insight on this please 'answer' or 'comment' here: http://water.tallyfox.com/questions/text/desalination