Texas Tribune
As oil and gas are extracted, water flows back up. It is all but unusable — unless treated. Often referred to as produced water, the grimy backwash is full of dirt, minerals and hundreds of chemicals, some of which can be radioactive. Companies must dispose of it somehow. Most, with state permission, inject it underground. Increasingly, oil producers are cleaning it up just enough to reuse it for more fracking. Click here to read the story.