“The impact of these extra millions of people has spread even beyond the space they physically occupy. Their industries have changed the chemical constituency of the atmosphere. The oceans that cover most of the surface of the planet have been polluted and increasingly acidified. We now realise that the disasters that continue increasingly to afflict the natural world have one element that connects them all - the unprecedented increase in the number of human beings on the planet.”

How Many People Can Live on Planet Earth? (BBC Horizon, 2009)

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David Attenborough70

British broadcaster and naturalist 1926

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