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Journalist Alok Jha shows how the way we are using freshwater has made it a precious finite resource. And it鈥檚 a resource on the edge of collapse. By 2050, over half the world鈥檚 population will live in a water-scarce region. But rather than working together to manage crucial water supplies, powerful states are manoeuvring to control the remaining stocks for themselves.

Beginning with one family鈥檚 well drying up in the desert of Arizona, and following the story all the way to political tensions in the Middle East, Alok argues that we need to recognise water as the most important shared resource in the world and take advantage of its cross-border nature to encourage international cooperation.

(Photo: The Jordan river on mountainside. Credit: Getty Images)