8 February 2012 Last updated at 11:21

More species slide to extinctionFerret

One fifth of animal and plant species are threatened by extinction, a global study warns, but conservation efforts have pulled some back from the brink.

FrogGuide to biodiversity

Find out more about the complicated relationship between humans and the natural world, and the implications of biodiversity loss.

Expert Views

Earth Watch: Richard Black

Earth News

Spending review
  • The threat to the riches of our natural world

Features & Analysis

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.