| http://www.w3.org/ns/prov#value | - ces, including oil, natural gas, coalbed methane, and geothermal resources, frequently results in bringing to the surface water extracted from underground sources. (2)Some of this produced water is used for irrigation or other purposes, but most of it is returned to the subsurface. (3)Reducing the amount of produced water returned to the subsurface, and increasing the amount that is made available
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