Cities around the world went dark between 8:30-9:30pm Saturday, marking Earth Hour.

The ‘Earth Hour’ movement by the World Wide Fund for Nature (WWF) calls for greater awareness and more sparing use of resources, especially fossil fuels that produce carbon gases and lead to global warming.

“With COVID-19 safety regulations continuing in several parts of the world, many countries will be celebrating Earth Hour online, mobilising millions of people from across the globe to speak up for nature,” the WWF said on their website.

“As the lights dim in homes and cities, Earth Hour will bring people together to put a virtual spotlight on our planet and the role people can play in global efforts for nature.”

Earth Hour is WWF's flagship global environmental movement which was first launched in Sydney, Australia in 2007.

The movement has grown to become one of the world's largest grassroots movements for the environment, inspiring individuals, communities, businesses and organizations in more than 180 countries and territories to take tangible environmental action for over a decade.