The Scots stars of Dr Who and Ugly Betty are challenging the Scottish public to test their climate knowledge with a new online game launched by Oxfam today.

'The Climate Challenge' features David Tennant (Dr Who) and Ashley Jensen (Ugly Betty, Extras) and a host of other celebrities who answer climate questions under the control of the online player.

'The Climate Challenge' is designed to raise public awareness about climate change and what can be done to tackle it.

It is being launched ahead of 'The Wave', Scotland's biggest ever demonstration in support of action on climate change, which takes place in Glasgow on Saturday December 5, and the United Nations climate summit in Copenhagen (December 7-18), which will bring together countries from around the world to agree a global deal on climate change.

As well as testing their own knowledge, players will be able to challenge and compete with their friends through Facebook. At the end of each game, players will also have the chance to take action on climate change by adding their name to a global petition demanding a fair and strong climate deal at the end of the year.

Ashley Jensen said:

"Did you know how much energy you save by putting on a sweater and turning your thermostat down by just two degrees? Climate change isn't just bad news for polar bears and melting ice caps - it's bad news for all of us and especially the world's poorest people. So know your facts and have your say by taking part in Oxfam's climate challenge at www.theclimatechallenge.org"

'The Climate Challenge' also features top celebrities Gael Garcia Bernal (Amores Perros, Motorcycle Diaries), Mackenzie Crook (Brothers Grimm, The Office, Pirates of the Caribbean), actress Miranda Richardson (Harry Potter, The Hours) and funnyman Mike Bonanno (Yes Men).

Mackenzie Crook said:

"The Climate Challenge is a fun and interactive way to understand more about what we're doing to our planet. There is a serious message behind this that we must put pressure on our leaders to agree an ambitious climate deal in Copenhagen."

Judith Robertson, Head of Oxfam in Scotland, said:

"Climate change is the biggest crisis the world has ever faced but there is still time to do something about it. Audience research shows that people care about climate change but don't really understand what's at stake for our planet. Oxfam hopes that millions of people play this game, learn some shocking but realistic facts about climate change and become fired up to do something about it - both personally and by lobbying their governments."