Over 170 countries are joining Earth Hour movement on Saturday 8:30 p.m. local time to switch off their lights for one hour to focus attention on climate change.

This year, Earth Hour is set to be a record-breaking celebration of our planet with an unprecedented 172 countries and territories having confirmed their participation, including nations on the climate frontlines like the Philippines, Maldives and Madagascar and key climate actors such as Brazil, the United States and China.

From Cambodia to Cameroon to Colombia, homes, offices, skylines and monuments will go dark as the world unites to inspire collective action to change climate change. Over 1,200 landmarks such as the Eiffel Tower in Paris and the Golden Gate Bridge in San Francisco will turn off their lights. Close to 40 UNESCO World Heritage Sites including the Acropolis in Athens and Edinburgh Castle in Scotland are also scheduled to go dark in support of Earth Hour.

Earth Hour was first celebrated in Armenia in 2008. The event was organized by WWF-Armenia. Since then, WWF-Armenia has been organizing Earth Hour each year.