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One of our most important freshwater resources is right beneath our feet, hidden between the rocks and particles of soil. But it might not be there for much longer. Around the world, we are sucking our water faster than the rain and snow can replace it. Professor Hannah Cloke explains how and why this is happening whilst rowing along one of England鈥檚 longest rivers, the Thames.

(Image: Human hand cupped to catch fresh water from a mountain lake, Credit: Getty Images.)