A Stanford-led study has provided the strongest evidence yet that warming oceans and declining oxygen levels caused Earth's largest mass extinction around 252 million years ago. The research explains why some marine animals survived while others nearly disappeared, offering fresh insight into how modern climate change could affect ocean ecosystems.

A Stanford-led study has provided the strongest evidence yet that warming oceans and declining oxygen levels caused Earth's largest mass extinction around 252 million years ago.…

The greatest mass extinction of all time was triggered by climatic conditions that are beginning to reappear today, scientists warn.