Earth Hour is organised by the World Wide Fund for Nature (WWF) and has been taking place every year since 2007.
This year's event is on Saturday 31st March from 8.30pm-9.30pm and will include the lights going off at famous buildings all around the world along with some very iconic buildings in Scotland.
Around 2.2 million people took part in the first Earth Hour in Sydney four years ago. Since then, it has grown into an international event with millions of people from all over the world getting involved.
As well as lights being switched off at famous landmarks including the Golden Gate Bridge in San Francisco and Rome’s Colosseum, others have used Earth Hour as an opportunity to have a candlelit dinner or watch a scary movie in the dark.
WWF encourage you to put your lights off for the hour and help observe Earth Hour to help raise awareness to excessive energy consumption and also the impact that this may have on climate change.
Earth Hour is a fantastic event and I've personally taken part in it over the last 4 years by holding Earth Hour parties at home.
Since the event started I have tried to encourage councils and some of the major landmarks of Scotland to take part in this, now huge, global event.
Many scientists agree that climate change is largely being driven by human activity and as this event grows each year more and more people might think about how their activities could be having an impact on the environment.
It's great to see big landmarks like Stirling Castle, Edinburgh Castle, the Forth Rail Bridge, Eilean Donan Castle and Glasgow Cathedral taking part. It's fantastic to also see my hometown getting behind the event with the lights of Paisley Abbey, Paisley Town Hall and the Council HQ all going dark for the hour.
There are hundreds of buildings set to turn off their lights for the event all over Scotland. Hopefully you'll take part in your own way and help spread the word. Check here to see if any landmarks in your area are taking part, and if not, perhaps see if you can persuade them to be part of Earth Hour 2013.