More than 80 countries now face water shortages to some degree.

Many important aquifer and river systems have been seriously depleted by water withdrawals for human use.

Because of population growth, as many as 3 billion people may face chronic water scarcity by 2025.

As more people need more water, the potential for civil conflicts, "water wars" and greater environmental damage increases.

1 | 2 | 3 | 4

next 60 second tour