Two-thirds of the world is covered in water, containing over a billion trillion liters of water.
The amount of H2O on our planet will always remain the same, and won’t run out as such.
According to a 2016 study by the University of Twente in the Netherlands, 4 billion people could face severe water shortages for at least a month every year.
In some regions, people are already severely affected by droughts and water scarcity.
And Pakistan could run dry by 2025, a UN report suggests.
"Locally, the problem is very acute," Johannes Schmiester, a water expert at WWF Germany, told DW.
Around 70 percent of all freshwater on the planet goes into irrigation of fields and feeding of livestock.
But in the industry as a whole – which produces a quarter of Europe’s tomatoes – still needs more water than local water resources can supply.
Researchers say the solution is to consider the entire geographical area and think in units of river basins.
Water consumption is much higher in industrialized countries, though – for example, the average person in Germany uses 140 liters per day.