Did it seem a little darker around your neighborhood at 8:30 Saturday night?

Earth Hour is an annual tradition in which people turn off their lights for an hour to spread awareness about sustainability and climate change. Started by the World Wildlife Fund in 2007, it’s traditionally been the last Saturday in March, and communities worldwide participate for an hour at 8:30 p.m. their local time.

This year the Sydney Opera House, the Kremlin in Moscow, Tokyo Tower, the Eiffel Tower, the Colosseum in Rome and the Petronas Twin Towers in Kuala Lumpur and many Las Vegas casinos were among the world landmarks that participated in Saturday’s Earth Hour 2020. The Empire State Building Space Needle in Seattle also traditionally participates in the effort.

This year, the movement took on added significance with much of the world sheltering in place to attempt a halt of the spread of coronavirus. WWF organizers went forward with Earth Hour, but all official public events were cancelled to abide by social distancing measures. Families were suggested to take in activities at home, such as sitting on porches or playing games by candle or flashlight.