Season 5, Episode 17 The Desert's Edge
First Aired: May 31, 1978
How arable terrain in and around the Sahara is turning into wasteland. Viewed: projects used to recultivate these areas, including the planting of trees with their own reservoirs; and a “drip-irrigation” system by which plants' roots are constantly kept moist.
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- Premiered: March 3, 1974
- Rating: None
- Premise: PBS's premier science-documentary series, which has won six Peabody Awards and more than 20 Emmys (four in 2002 alone) since its 1974 debut. `Nova' clearly, and often engagingly, `demystifies' a vast range of science, technology and history topics---past a… (more)