NASA ASTER image of an approx. 1443 km² area of fields in Kansas which are watered from the Ogallala aquifer with center pivot irrigation systems.
... and here in SA is the creeping crisis of acid mine drainage and just plain old pollution.
SA dams: a rapidly worsening water crisis
Stop ignoring the water crisis
Union chides Aurora, Grootvlei gold mine water fears return
Why world's taps are running dry
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