Figure 13.21

Water contamination by fracking. (A) Fracking fluid is stored on site in plastic-lined containment ponds like this one. (B) The groundwater in some areas near fracking operations has become so contaminated with methane that it is possible to set the water on fire as it comes out of the faucet.
(A. © Mladen Antonov/AFP/Getty Images; B. © Melanie Stetson Freeman/The Christian Science Monitor/Getty Images)