In celebration of “Earth Hour,” on Saturday night the Las Vegas Strip will shine a little less bright for 60 minutes.

Casinos including Caesars Palace, Luxor, MGM Grand, Excalibur and Planet Hollywood will dim their exterior lights between the hours of 7:30 p.m. and 8:30 p.m. in an effort to raise awareness for climate change, according to the Las Vegas Review-Journal. Las Vegas has taken part in Earth Day seven times. The Eiffel Tower and the Acropolis join the Strip resorts in the annual worldwide effort.

According to earthhour.org, “Earth Hour is a worldwide grassroots movement uniting people to protect the planet, and is organised by WWF. Engaging a massive mainstream community on a broad range of environmental issues, Earth Hour was famously started as a lights-off event in Sydney, Australia in 2007. Since then it has grown to engage more than 7000 cities and towns worldwide, and the one-hour event continues to remain the key driver of the now larger movement.”