Wastewater produced in oil and gas extraction operations is often disposed of in deeper layers previously emptied of their oil and gas. Credit: USGS

Wastewater produced in oil and gas extraction operations is often disposed of in deeper layers previously emptied of their oil and gas. Credit: USGS

Wastewater produced in oil and gas extraction operations is often disposed of in deeper layers previously emptied of their oil and gas. Credit: USGS

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Alka Tripathy-Lang, PhD

Alka Tripathy-Lang is a freelance science writer based in Chandler, Arizona, and holds a Ph.D. in geoscience.
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