Studies that were published Tuesday in the Water Resources Research journal noted that NASA’s GRACE (Gravity Recovery and Climate Experiment) satellites have determined that twenty-one of the world’s 37 largest aquifers, in locations that range from India and China to the United States and France, have passed their sustainability tipping points. What this means is that more water has been removed from them than has been replaced, in over a decade of watching.

These are the first studies to utilize data from space to determine groundwater loss, further cementing the usefulness of specialized satellites in space. The way GRACE did this was by measuring changes in the Earth’s gravity, as they are affected by the mass of water.

If you are interested in the GRACE satellites or the research, you can find more information here:
http://www.nasa.gov/mission_pages/Grace

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