As the most pressing resource, water holds the strategic key to peace, public health and prosperity. The battles of yesterday were fought over land. Those of today are over energy. But the battles of tomorrow will be over water. And nowhere else does that prospect look more real than in Asia.

According to a 2006 U.N. report, Asia has less fresh water than any other continent other than Antarctica. In that light, water is emerging as a key challenge for long-term Asian peace and stability.

Although water covers two-thirds of Earth, much of it is too salty for use. Barely 2.5 percent of the world's water is potentially potable, but two-thirds of that is locked up in the polar icecaps and glaciers. So, less than 1 percent of the total global water is available for consumption by humans and other species.