On 28 March 2008, people, businesses and iconic buildings around the world switched off their lights for one hour - WWF's Earth Hour - in support of tackling global warming.
Now WWF wants a billion people people around the world to sign a petition to show their on-going support for fighting climate change. Fill in your details to show that you want world leaders to take action at the UN climate change summit in Copenhagen in December.
You can also tick boxes below to be included on WWF's mailing list and our Go Green & Save mailing list, so that we can send you free email alerts regarding future green competitions and freebies.
(Fields marked with a * must be filled in - the rest are up to you.)