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)

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