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In a Horizon special, naturalist Sir David Attenborough investigates whether 
the world is heading for a population crisis. 

In his lengthy career, Sir David has watched the human population more than 
double from 2.5 billion in 1950 to nearly seven billion. He reflects on the 
profound effects of this rapid growth, both on humans and the environment. 

While much of the projected growth in human population is likely to come from 
the developing world, it is the lifestyle enjoyed by many in the West that has 
the most impact on the planet. Some experts claim that in the UK consumers use 
as much as two and a half times their fair share of Earth's resources.

Sir David examines whether it is the duty of individuals to commit not only to 
smaller families, but to change the way they live for the sake of humanity and 
planet Earth.