Offshore fresh groundwater reserves as a global phenomenon

Vincent E.A. Post, et al., writing in Nature:

The flow of terrestrial groundwater to the sea is an important natural component of the hydrological cycle. This process, however, does not explain the large volumes of low-salinity groundwater that are found below continental shelves. There is mounting evidence for the global occurrence of offshore fresh and brackish groundwater reserves. The potential use of these non-renewable reserves as a freshwater resource provides a clear incentive for future research. 

Good news, though the non-renewable part shouldn’t be overlooked.

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