Are We Running Out Of Groundwater?

35% of the freshwater used by humans comes from underground aquifers.  NASA has been studying the aquifers for a decade and it released a study which shows that 21 of the 31 aquifers have  reached a tipping point.  They lose more water every year than they replace.  We are familiar with the situation in California where the drought has made the state more dependent upon underground water sources.  The NASA report includes a graph which maps the aquifers and indicates the distress level in each of them.  It also describes the implications of the depletion pattern that it has observed.