The world's largest rivers begin in glaciated mountain regions. However, climate change may cause many Glaciers to disappear. Will water become scarce? The world's largest rivers have their sources in glaciers – will the global population be left high and dry without  the "eternal" ice? A glacial river in Vatnajökull, Iceland [Credit: Matthias Huss/ETH Zurich]There are around 200,000 glaciers worldwide. They play a central role...

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