World without water: six solutions to a shortage

The World Bank is planning to devote up to $5bn a year to try to fix it. Goldman Sachs says it poses a risk to economic growth. And Matt Damon, the actor, has tipped a bucket of toilet water over his head to bring attention to it. The problem is water — a vital resource that has long been poorly managed or taken for granted in much of the world and that has rising populations driving competition for supplies. The search for solutions to uneven and inadequate water supply has already led to improvements in irrigation, desalination and wastewater recycling, and is spurring development of innovative technologies such as waterless fracking in the energy industry and more water-saving devices at home.

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