World's rivers in 'crisis state', report finds

http://www.sciencedaily.com/releases/2010/09/100929132521.htm#

Keep in mind that the water from rivers goes to the world´s oceans.

ScienceDaily (2010-10-01) -- The world's rivers, the single largest renewable water resource for humans and a crucible of aquatic biodiversity, are in a crisis of ominous proportions, according to a new global analysis.