When did Horizon Season 26 Episode 5 air?
Horizon Season 26 Episode 5 aired on February 6, 1989.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Horizon looks at the damaging effects of pollution and tourism on the Swiss Alps in Europe.
Direct answers for episode-level questions and details.
Horizon Season 26 Episode 5 aired on February 6, 1989.
This episode runs for approximately 60 minutes.
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