Did you know that it takes 500 litres of water to grow one measly kilogramme of potatoes? Or that each Brit uses an average of 150 litres a day? And the South East of England actually has less water per head of population than the Sudan or Ethiopia?

In his new book, award-winning environmental journalist Fred Pearce warns of an approaching water crisis – the world is quite literally running out of water. Across the globe, huge rivers are being reduced to tiny trickles and ancient underground
stores are being emptied, never to be refilled again. But, how much do you really know about the way we use water?

See if you can answer the 20 questions in the water quiz, devised by the author himself.

The rules couldn't be simpler. There are 20 questions, each with a choice of three answers. Pick the correct one!

Play the quiz >>

Buy a copy of When the Rivers Run Dry here.