• São Paulo
  • Bangalore
  • Beijing
  • Cairo
  • Jakarta
  • Moscow
  • Istanbul
  • Mexico City
  • London
  • Tokyo
  • Miami

Over one billion people lack access to water and another 2.7 billion find it scarce for at least one month of the year. A 2014 survey of the world’s 500 largest cities estimates that one in four are in a situation of “water stress”

According to UN-endorsed projections, global demand for fresh water will exceed supply by 40% in 2030, thanks to a combination of climate change, human action and population growth.

Read why at the BBC.