Nearly everyone in the US depends on food crops grown in California, so farmers must continue to pull what little water remains in underground aquifers. This is causing the state to actually sink. It's been sinking for decades, but the problem is getting worse. Reveal News writes, "Last summer, scientists recorded the worst sinking in at least 50 years. This summer, all-time records are expected across the state as thousands of miles of land in the Central Valley and elsewhere sink."
As a result, the "sinking is starting to destroy bridges, crack irrigation canals and twist highways across the state, according to the U.S. Geological Survey."