People want to drink clean water even more than they want to breathe clean air. So it’s a good thing that almost 3 billion people have gained access to clean water over the last 25 years.

But current water use, population growth and the effects of climate change have caused two-thirds of the global population – about 4 billion people – to live under conditions of severe water scarcity at least one month of the year.

Some of this scarcity has led to violence and conflict, especially in Africa, Southern Asia and the Middle East.  (Credits: Forbes)