Every Thursday, a new episode of Living Planet brings you environment stories from around the world, digging deeper into topics that touch our lives every day. The prize-winning, weekly half-hour radio magazine and podcast is produced by Deutsche Welle, Germany's international broadcaster - visit dw.com/environment for more.
What do you do if there isn't enough fresh drinking water around? According to the World Resources Institute, a quarter of the world's population doesn't have enough water to meet demand. DW explores ways to combat water scarcity.