Scientists say there is growing evidence to suggest that irreversible changes to the Earth's environmental systems are already taking place, and that we are now in a "state of planetary emergency."

Scientists say there is growing evidence to suggest that irreversible changes to the Earth's environmental systems are already taking place, and that we are now in a "state of planetary emergency." https://t.co/gskseIDSmq

— CNN (@CNN) November 30, 2019