15 mayo 2015
California and other parts of the western U.S. are experiencing extended severe drought conditions. The Santa Clara Valley in California underwent extensive groundwater development from the early 1900s through the mid-1960s. This development caused groundwater level declines of more than 200 feet.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/sZm-jglujRw/150515125904.htm
