More than 2 billion people lack safe drinking water. That number will only grow.
As populations grow and climate change shrinks freshwater stores, water scarcity takes center stage
![child drinking](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/08/081818_waterstats_feat.jpg?fit=1030%2C567&ssl=1)
THIRSTY WORLD A child drinks water at a well in South Sudan, a country in which only half the population has ready access to clean drinking water.
Stefanie Glinski/AFP/Getty Images