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Depleting ground water is going to be a major concern for the whole world in the coming years. Aquifers provide 35% of the water for hundreds of millions of people and are increasingly being tapped, despite taking thousands of years to fill up. A decade long study reports have water has been decreased in 21 of the world's 37 largest aquifers.

“The water table is dropping all over the world. There's not an infinite supply of water,” said, Jay Famiglietti, NASA's Jet Propulsion Laboratory in California.

The researchers were not able to measure the exact amount of water in aquifers, but their findings showed many aquifers have less water than previously thought. While some groundwater trickles back into aquifers, much of it evaporates and is lost in rains in the oceans.

“World Water Day reminds us of the importance of having access to a sufficient amount of safe water for a healthy and happy life. This is essentially our human right to water. But how many people can enjoy such right? Is this a problem of availability of the resource or a political matter?” said Flavia Schlegel, UNESCO Assistant Director General for the Natural Sciences.

By Premji