The lights will be switched off in Glasgow this weekend in support of the Earth Hour campaign.
At 8.30pm on Saturday, the City Chambers, Kelvingrove Art Gallery, the Clyde Arc bridge and Glasgow Cathedral will be plunged into darkness for an hour.
It is expected business, homes, organisations and community groups across the city will support the big switch off.
Earth Hour has been organised by the World Wildlife Fund to let people show their support for the campaign on climate change.
Last year, 134 countries worldwide took part with landmarks like the Eiffel Tower and Sydney Opera House switching off their lights.
A city council spokesman said: "Glasgow is working hard to cut our carbon emissions and become one of the greenest cities in Europe.
"We are delighted to be taking part again in the Earth Hour big switch off and hope as many people in Glasgow as possible can play their part in supporting the worldwide fight against climate change."
Dr Richard Dixon, director of WWF Scotland, said: "It is great news that Glasgow City Council has given its backing once again to WWF's Earth Hour 2012.
"Already it is looking to be another great year with communities up and down the country joining together with others from around the world in a dramatic hour of action on climate change.
"Earth Hour is a simple way for people to show their support for strong action on climate change."