Does Pumping Groundwater Raise Sea Levels?

For many crops around the world, farmers must supplement rainfall with irrigation — and much of this added water comes from underground reservoirs. Globally, extraction rates now greatly exceed that of groundwater recharge, and have begun raising sea levels.Cinoby/Istockphoto

Pumping Groundwater Raises Sea Level -- Science News

Two new studies flag an underreported factor in global ocean change.

Pumping groundwater, some 70 percent of it to irrigate crops, has recently become a potent force in global sea-level rise, two new studies conclude.

It sounds obvious: Once brought to the surface, water will eventually run into the seas, says hydrologist Yoshihide Wada of Utrecht University in the Netherlands. But until now, most major assessments of factors affecting sea-level rise — such as those reported by the Intergovernmental Panel on Climate Change — ignored the role of groundwater extraction, he says. For instance, the IPCC has assumed that groundwater extraction would be largely balanced by river water impounded by dams.

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My Comment: If true .... this is a serious problem. Especially since much of our food is produced using irrigated water.