Why is sand in short supply?


The world uses 40 billion tonnes of sand each year to build cities and towns, but global reserves are running low. We find out why.Click here to subscribe to The Economist on YouTube: http://econ.trib.al/rWl91R7 Daily Watch: mind-stretching short films throughout the working week.For more from Economist Films visit: http://films.economist.com/ Check out The Economists full video catalogue: http://econ.st/20IehQk Like The Economist on Facebook: https://www.facebook.com/TheEconomist/ Follow The Economist on Twitter: https://twitter.com/theeconomist Follow us on Instagram: https://www.instagram.com/theeconomist/ Follow us on LINE: http://econ.st/1WXkOo6 Follow us on Medium: https://medium.com/@the_economist


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Added: Friday, August 4th, 2017
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