Excellent overview of water, our most precious resource.
“By 2050, a third of the people on Earth may lack a clean, secure source of water. Join National Geographic in exploring the local stories and global trends that define the world’s water crisis. Learn about freshwater resources and how they are used to feed, power, and sustain all life. See how the forces of technology, climate, human nature, and policy create challenges and drive solutions for a sustainable planet.”
http://environment.nationalgeographic.com/environment/freshwater/
