In Argentina, for example, Earth Hour has helped mobilise public support for the creation of a 3.4 million hectare-wide marine protected area, while in Uganda, local communities and businesses have created the first Earth Hour forest.
Despite the terror attack in Westminster on Wednesday, the Houses of Parliament and Big Ben are joining more than 270 landmarks across the UK in switching off the lights for conservation charity WWF's Earth Hour.
Colin Butfield, director of campaigns at WWF, said: "Following the tragic events in London earlier this week, we are inspired and grateful to hear that the Houses of Parliament and Big Ben will be switching off their lights to show support for global action on climate change."He added: "Earth Hour is the world's biggest climate change event.
All you have to do is switch off your lights for one hour to join hundreds of millions around the world to send a clear signal that we must act and we must act now." Whether you want to tug on your walking boots and join a ranger-led walk, feel like star-gazing or even want to stay indoors, check out a full list of Scottish events here.
Alternatively, you could set up your own JustGiving fundraising page and encourage people to donate, or donate via the website earthhour.wwf.org.uk/fundraising/.