On the 19th of March, millions of people in all pockets of the world will be turning off their lights at 8.30 p.m. in honour of Earth Hour.
With climate change and global warming being at an all-time high, the World Wide Fund for Nature (WWF) is striving to make a small but significant impact in how we care for our world.
Lights out is only for one hour, but with so many people taking part, activists hope that just a little change like this can help make a greater impact.
Earth Hour began in Sydney, Australia in 2007 as a light show and has since then grown into a global movement.
More than 7,000 cities and towns across the globe participate in the event every year, turning off their non-essential lights. The purpose is to unite people around the world to protect the planet and to raise awareness of environmental issues.
To find out more and become part of the cause, visit: http://earthhour.wwf.org.uk/.