To WWF Cymru's delight Cardiff County Council and the Welsh Assembly Government agreed to turning off all non essential lighting in support of the initiative.

Morgan Parry, Head of WWF Cymru said: "We were encouraged to see Cardiff Council and WAG set an example to the rest of Wales.

"Earth Hour was conceived by WWF to deliver a powerful message about the need for urgent action on global warming. Here in the UK this ties in with and emphasises the need for a strong Climate Change Bill to go before the UK parliament."

To continue to lead the way in tackling climate change through robust legislation people must push for a strong Climate Change Bill which is one of the most important pieces of legislation ever to go before the UK Parliament.

However, scientific evidence shows that we will need a reduction in the UK's CO2 of at least 80% by 2050 if we are to avoid the worst impacts of climate change. To make sure both these asks are included in the Climate Change Bill, go to http://wwf.org.uk/getonboard and show your support.

Find out more about how you can help fight climate change everyday by visiting http://footprint.wwf.org.uk/