A biodiversity summit is where scientists and policy-makers meet for talks on what can be done to preserve biodiversity.

Biodiversity is the variety of all life on Earth - including animals, plants, fungi and micro-organisms like bacteria.

Together they provide the planet with everything necessary for survival, including fresh water, clean air, food and medicine. Biodiversity matters because humans cannot get these benefits from individual species - a rich variety of living things must work together in harmony as part of an ecosystem.

Plants, for example, are very important for improving our physical environment: cleaning the air, limiting rising temperatures and providing protection against climate change.