Sarah BrealeyPeople of Norwich, businesses and schools are being asked to support WWF's Earth Hour this month and join hundreds of cities around the world going dark for one hour.Sarah Brealey

People of Norwich, businesses and schools are being asked to support WWF's Earth Hour this month and join hundreds of cities around the world going dark for one hour.

WWF, the conservation organisation, is encouraging everyone around the world to turn off their lights from 8.30-9.30pm on Saturday, 27 March to show global support for action against climate change.

Norwich City Council has already signed up to switch off at wwf.org.uk/earthhour and other local authorities and landmarks are also being encouraged to sign up.

It is billed as 'the biggest ever climate change event on earth', with 92 countries already signed up and more than 800 schools, 30 local councils and 260 businesses switching off in the UK.

Colin Butfield, head of campaigns at WWF-UK, said: 'WWF's Earth Hour is an inspiring opportunity for people living in Norwich to do something positive to help tackle climate change. Last year's Earth Hour was the biggest ever climate change event. By making it even bigger this year, we can all send a strong message to world leaders that people around the globe are united in calling for decisive action on climate change.'

People can watch the progress in Norfolk on a new interactive Earth Hour map online at earthhourmap.wwf.org.uk. They can see how the county is performing and encourage their friends and family to join them in helping ensure Norfolk stands out.

Sign up at www.wwf.org.uk/earthhour