When humans made their mark on the world

When did humans begin to change the world beyond recognition?
15 March 2015
Presented by Kat Arney

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Geologists like to divide up history into epochs, or eras, separated by events that leave an indelible mark in the geological record of the earth - for example, the meteorite strike that finished off the dinosaurs 66 million years ago, whose impact is written in rocks across the globe. Similarly we humans have made our own irreversible impact on the planet, ushering in what's become known as the anthropocene era. But when did it actually start? Simon Lewis spoke to Kat Arney about how he's has been figuring it out.

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