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?
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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Episode 18 of season 46 of Horizon: “How Many People Can Live on Planet Earth?”. Aired 2009-12-09. Watch it online free on ZapFlix.