A major UN meeting is due to take place in 2021 in Glasgow in Scotland.
Nations will be revealing how they intend to cut their greenhouse gas emissions. Which means we’ll find out if their commitments are ambitious enough to stop the worst effects of climate change. But just what is climate change? And why are scientists calling for urgent action?
The BBC’s global science correspondent Rebecca Morelle explains.
Produced and edited by Larissa Kennelly
Graphics by Terry Saunders
This video was first published in January 2020.