The Millennium Stadium joined other major landmarks from across the globe by switching its lights off for one hour on the 28th March 2009 to support WWF’s Earth Hour.

The Sydney Opera House, the Acropolis, the Bird’s Nest stadium in China, the pyramids of Giza, the Eiffel Tower, the Empire State Building and Big Ben to name just a few all plunged into darkness for the largest global action on climate change ever.

Also in Wales, Minister for the Environment, Sustainability and Housing Jane Davidson ‘switched off’ the lights at the Senedd building in Cardiff Bay which also saw the Oval basin and St Davids Hotel plunge into darkness for an hour and a candle lit dinner held at Gilby’s restaurant in aid of the event.

Morgan Parry, Head of WWF Cymru, said: "Earth Hour was a hugely inspiring event as landmarks across Wales fell dark for an hour. It was a dramatic global expression of the strength of support for action on climate change. World leaders can be left in no doubt that they must do what is right at the UN Climate Summit being held in Copenhagen later this year and the time to act is now.”

4,088 cities and towns in more than 88 countries took part in Earth Hour, including 66 national capitals and 9 of the10 most populated metropolises on the planet. 100 cities and towns in the UK, from Cardiff, London, Belfast, and Edinburgh to Manchester, Newcastle, Bristol and Birmingham joined in alongside more than 1000 schools and nearly 700 businesses.