Rebuilding after disaster. In California, the past several years have brought some of the deadliest and most destructive wildfires in the state's history. (Photo: Lightspring/Shutterstock)

In 2015, 15,000 residents in the southern California community of Porter Ranch were evacuated from their homes for several months due to a significant gas leak at a nearby facility. The environmental disaster —- the worst natural gas leak in United States history — was found to have been caused by a leak sprung from an underground reservoir operated and maintained by Southern California Gas (SoCalGas).

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