Mark Olalde

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Mark Olalde is a Reporter at ProPublica covering the environment in the Southwest.

The Cold War Legacy Lurking in US Groundwater
For the first time, ProPublica has cataloged cleanup efforts at the 50-plus sites where uranium was processed to fuel the nation’s nuclear arsenal. Even after regulators say cleanup is complete, polluted water and sickness are often left behind.
Big Oil Companies Are Selling Their Wells. Some Worry Taxpayers Will Pay to Clean Them Up.
Shell and ExxonMobil are selling their California wells despite oil selling at high prices. Experts say one reason is looming liability for environmental cleanup.
The Southwest’s Drought and Fires Are a Window to Our Climate Change Future
In a Q&A, experts describe how a new climate reality threatens the Southwest, the fastest-growing region in the U.S.
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