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'We have unleashed a mass extinction event'

15,000 scientists have backed a 'warning to humanity' about the dire need to change our behaviour in order to save the Earth. Scientists Kate Moran and Stephen Woodley discuss.
15,000 scientists have backed a 'warning to humanity' about the dire need to change our behaviour in order to save the Earth. Scientists Kate Moran and Stephen Woodley discuss. 7:45