As many as one million species are at risk of extinction, posing a profound threat to human well-being, a sweeping UN report concluded. Brad Plumer of The New York Times reports.

Humans are transforming Earth's natural landscapes so dramatically that as many as 1 million plant and animal species are now at risk of extinction, posing a dire threat to ecosystems that people all over the world depend on for their survival, a sweeping new United Nations assessment has concluded.

The 1500-page report, compiled by hundreds of international experts and based on thousands of scientific studies, is the most exhaustive

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