Timothy Shanahan

A worker moves irrigation tubes on a farm in Pinal County, Ariz. A two-decade drought has made water supplies harder to secure. Carolyn Cole/Los Angeles Times via Getty Images

Climate models reveal how human activity may be locking the Southwest into permanent drought

The drought has been linked to the Pacific Decadal Oscillation, a natural climate pattern. A new study finds global warming is now influencing that natural phenomenon.

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