Tamara Avellán

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A pipe pumps polluted water from the Nanfeihe River into a treatment pool, in Hefei, Anhui province September 1, 2013. Credit: Reuters/Stringer

How Recycled Water Could Revolutionise Sustainable Development

With the invention of flush toilets, the volume of waste created when humans go to the bathroom increased almost 20-fold. Credit: Dennis Hlynsky/Flickr CC BY-NC 2.0

The World Needs More Toilets – But Not Ones That Flush