To turn this on its head, the group Sarvajal, which means Water For All, tackled this issue of ownership by creating a Water ATM and kiosk franchise system in India.

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Today, it includes 23 hotels, four theme parks (Magic Kingdom, Epcot, Hollywood Studios and Animal Kingdom), almost 100 restaurants, two water parks (Typhoon Lagoon and Blizzard Beach), a sports complex (Disney's Wide World of Sports), and two shopping and nightlife districts (Downtown Disney and Disney's Boardwalk), as well as six golf courses, three miniature golf courses and lagoons with water sports, all connected by a complicated system of free buses, boats and monorails.

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The reason for that is it would, over a much wider area, take out things like the National Grid, on which we all rely for almost everything, take out the water system, the sewage system.

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Like many cities, Greenwich has created a geographic information system - a map that shows all the hidden bones and arteries of modern civilization: water mains, storm sewers, utility lines.

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And water would be all the more exciting on Ganymede because it is the largest moon in the solar system (larger even than the planets Mercury and Pluto) and, like earth, it has a permanent magnetic field that protects part of its surface from bombardment by certain sorts of life-destroying radiation.

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The bug infests most elements of everyday life: electricity, gas and water supplies, telephone services, the banking system, health services, transport and industry are all at risk if it is not caught in time.

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