Humans pushing 1 million species to brink of extinction, says UN report

A new UN report reveals the extent to which mankind is changing life on Earth. Written by an international panel of experts, it concludes that nearly a quarter of animal and plant groups are at risk of extinction, some within decades. William Brangham talks to one of the report’s authors, the National University of Mexico’s Patricia Balvanera, about what’s driving the changes and how to stop them.

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