Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 16 · Episode 21 ·
A Treasury of Trees
Horizon investigates how the British landscape is changing its appearance with native trees being replaced by imported species.
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Episode 21 of season 16 of Horizon: “A Treasury of Trees”. Aired 1979-11-12. Watch it online free on ZapFlix.