The Key deer is losing the only place it lives, raising uncomfortable questions for the people tasked with keeping endangered species alive.

A new global assessment of the world's amphibians finds that more than 2 of every 5 known species is at risk of extinction. Habitat loss, disease and climate change are the main drivers.

The most significant part of the U.N. pact is a commitment to protect 30% of land and water considered important for biodiversity by 2030, up from 17% of terrestrial and 10% of marine areas.

"The loss of nature and rising water insecurity are global health threats that must be confronted together," Secretary of State Antony Blinken said.

The influential and sometimes controversial Harvard professor first made his name studying ants. He later broadened his scope to the intersection between human behavior and genetics.