UN Biodiversity summit: What is biodiversity?

Hundreds of thousands of different species of animals and plants are facing extinction because of human activity, according to the United Nations.

A report from the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES), external found this biodiversity crisis is on a par with - and maybe exceeds - climate change.

But what is biodiversity and why is it important?

BBC Health, Science and Environment correspondent, Laura Foster explains why biodiversity is important for the planet and how it affects humans too.