GLOBAL WARMING HAS FOCUSED concern on land and sky as soaring temperatures intensify hurricanes, droughts and wildfires. But another climate crisis is unfolding, underfoot and out of view.

Many of the aquifers that supply 90 percent of the nation’s water systems, and which have transformed vast stretches of America into some of the world’s most bountiful farmland, are being severely depleted. These declines are threatening irreversible harm to the American economy and society as a whole.

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