By Al Granberg
ProPublica
Several layers of steel casing typically enclose a well bore. The empty spaces between can be sealed with cement.
This graphic comes to Circle of Blue from ProPublica, an independent, non-profit newsroom based in Manhattan that produces investigative journalism in the public interest.


TAGS: chokepoint_infographic, climate change, Energy policy, energy problems, fracking, fracking pollution, natural gas, natural_gas_multimedia, Water and Energy, Water Pollution
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