https://www.propublica.org/article/water-aquifers-groundwater-rising-ocean-levels
The researchers were surprised to find that the loss of water on the continents has grown so dramatically that it has become one of the largest causes of global sea level rise.
Moisture lost to evaporation and drought, plus runoff from pumped groundwater, now outpaces the melting of glaciers and the ice sheets of either Antarctica or Greenland as the largest contributor of water to the oceans.
The study examines 22 years of observational data from NASA’s Gravity Recovery and Climate Experiment, or GRACE, satellites, which measure changes in the mass of the earth and have been applied to estimate its water content...........
Since 2002, the GRACE sensors have detected a rapid shift in water loss patterns around the planet. Around 2014, though, the pace of drying appears to have accelerated, the authors found, and is now growing by an area twice the size of California each year. “It’s like this sort of creeping disaster that has taken over the continents in ways that no one was really anticipating,”
The earth above it collapses as the ground compresses like a drying sponge. The visible signs of such subsidence around the world appear to match what the GRACE data says. Mexico City is sinking as its groundwater aquifers are drained, as are large parts China, Indonesia, Spain and Iran, to name a few. A recent study by researchers at Virginia Tech in the journal Nature Cities found that 28 cities across the United States are sinking — New York, Houston and Denver, among them — threatening havoc for everything from building safety to transit. In the Central Valley, the ground surface is nearly 30 vertical feet lower than it was in the first part of the 20th century.
But with climate change, these same drying regions are seeing less rainfall.
the middle band of Earth is becoming less habitable. It also correlates closely with the places that a separate body of climate research has already identified as a shrinking environmental niche that has suited civilization for the past 6,000 years. Combined, these findings all point to the likelihood of widespread famine, the migration of large numbers of people seeking a more stable environment and the carry-on impact of geopolitical disorder.
the Pacific Institute, has tracked more than 1,900 incidents in which water supplies were either the casualty of, a tool for or the cause of violence. In Syria, beginning in 2011, drought and groundwater depletion drove rural unrest that contributed to the civil war, which displaced millions of people. In Ghana, in 2017, protesters rioted as wells ran dry. And in Ukraine, whose wheat supports much of the world, water infrastructure has been a frequent target of Russian attacks.
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