The always interesting "National Geographic Specials" return for a new season tonight with "The Power of Water," further evidence that the most precious resource on Earth may not be gold or silver (8 p.m., KCET Channel 28 and KPBS-TV Channel 15; 7 p.m., KVCR-TV Channel 24).
While water covers seven-tenths of the Earth's surface, only 3% is fresh water and a mere 1%--in rivers, lakes, streams and wetlands--is available to sustain our lives. As the Earth's population continues to expand, the demand on the planet's water supply is nearing the point of exhaustion.
"The Power of Water" chooses to look at five freshwater trouble spots in the United States and what producer-writer-director Susan Winslow and her team have chosen to show may not be new news but it is distressing news, indeed.
The special takes us to the Midwest where the Ogallala aquifer, which covers parts of eight states, is replenishing itself at a painfully slow rate. The future of many family farms in the High Plains is tied to the diminishing aquifer.