When did Horizon Season 46 Episode 18 air?
Horizon Season 46 Episode 18 aired on December 9, 2009.
Horizon
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 46 · Episode 18
How Many People Can Live on Planet Earth?
Dec 9, 2009
Naturalist Sir David Attenborough investigates whether the world faces a population crisis and if it is the duty of individuals to change the way they live.
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How long is Horizon Season 46 Episode 18?
Runtime information for this episode is not available yet.
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