Scientists: Humans must respect these 9 boundaries to keep Earth habitable

All life on Earth is sustained by vital biogeochemical systems, which are in delicate balance. Humans are destabilizing these Earth processes, endangering the stability of the "safe operating space for humanity."

'There is no vaccine for climate change,' U.N. environment chief says

Global goals and targets for climate change adaptation are unclear, says U.N. report, and countries lack sufficient policies, plans and financing.