Skylines around the world went dark as millions of people celebrate Earth Hour to show their commitment to protecting the planet. "This is our chance to switch off and speak up for nature," wrote Earth Hour official account on Instagram.

Cities around the world turned off the lights at 8:30 pm local time on Saturday, March 30 to mark Earth Hour, answering the call for global action on climate change.

Earth Hour was found as s a call for awareness and economical use of resources, especially fossil fuels that produce carbon dioxide, main cause of global warming.

Paris turned off its landmark the Eiffel Tower's nightly twinkle to mark Earth Hour. The Eiffel Tower, illuminated (top) and switched off (bottom). (Photo: AFP)

Australian landmark the Sydney Opera House in dark for Earth Hour event on March 30, 2019. (Photo: VCG)

The Victoria Harbor before (top) and after (bottom) its lights went out for the Earth Hour environmental campaign in Hong Kong. And the city’s popular tourist attraction known as the Symphony of Lights was cancelled. (Photo: AFP)

The Hotel Indonesia Roundabout, one of Jakarta capital landmark were lit back in the normal condition, after the Earth Hour in Jakarta on Wednesday, March 30, 2019. (Photo: VCG)

Russian landmark the Kremlin before (top) and during Earth Hour in Moscow, March 30, 2019. (Photo: VCG)

Russian landmark the Kremlin before and during Earth Hour in Moscow. (Photos: AFP)

French landmark Arc de Triomphe, illuminated (top), in Paris and switched-off (bottom) during the Earth Hour on March 30, 2019. (Photo: VCG)

The financial district of Pudong before and during Earth Hour in Shanghai, China. (Photos: VCG)

The Grand Palace before and during Earth Hour in Bangkok, Thailand. (Photos: VCG)

The Biyong Palace inside the Guozijian Imperial Academy is shown before and after having its lighting switched off to mark Earth Hour in Beijing, China. (Photos: AP)