Dinosaur bones revealed by melting ice

Climate change

Earth's climate is not constant. Over geological time, the Earth's dominant climate has gone from ice age to tropical heat and from steamy jungles to searing deserts. When such climate change occurs abruptly - either in the form of a global warming or cooling - animals and plants have no time to adapt so mass extinctions can occur.

Watch video clips from past programmes (6 clips)

In order to see this content you need to have an up-to-date version of Flash installed and Javascript turned on.

View all 6 video clips

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.