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In the U.S., the world's largest body of freshwater,

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the Ogallala Aquifer, an underground lake that extends

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from the Colorado Rockies to South Dakota

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 going all the way down to the Texas Panhandle
with a range of 50 to 300 feet of depth.

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This water resource is what has made America's plains

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the "bread basket" of the world. Unfortunately,
like an oil well, this won't last forever.

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The Ogallala used to have an average depth of 240 feet.

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Today its average depth is just 80 feet.