An expected 10,000 people in Scotland will switch off their lights in unison on Saturday to mark an environmental charity's climate change campaign.
Earth Hour, started by WWF in 2007, is designed to highlight the impact climate change is having on people and nature. So far, 8,886 people have signed up using WWF Scotland's online map or by writing to the charity. WWF Scotland said it expects the number to rise to over 10,000 by the time of the switch-off, at 8.30pm.
Some of the country's best-known landmarks, including Edinburgh Castle and the Forth Rail Bridge, will be plunged into darkness for the event. Also taking part are 892 schools across the country, with rolls totalling 274,866 pupils, which held Earth Hour-themed assemblies and classes this week.
WWF Scotland said it has also been offered the support of all 32 of Scotland's local authorities, as well as businesses and other organisations.
The environmental group is encouraging people to celebrate the natural power of the planet and show their support for "clean, green, renewable energy".
Lang Banks, director of WWF Scotland, said: "We are very proud that Scotland is again getting behind WWF's Earth Hour in such a big way. From political leaders, school children, local authorities and landmarks, it is great to see so many people getting behind this global event.
"When people take part they'll be showing their support for global action on climate change and backing the switch to renewable energy. It promises to be the world's biggest event celebrating the power of the planet and we encourage people throughout Scotland to join in."