Organised by the World Wide Fund for Nature, Earth Hour is observed every year to create awareness about conservation of energy and climate change. Around the world, people and organisations turned their lights off from 8:30 to 9:30 pm local time.
A boy with his face decorated with luminous ink poses for a photograph with others during the symbolic switching off of the lights known as Earth Hour on Saturday in Lisbon, Portugal.
In this two photo combination picture, the Eiffel Tower with its usual lighting at left, and after the lighting was switched off at right, at the occasion of the Earth Hour, in Paris, France.
The Acropolis of Athens has gone dark as Greece's capital joins thousands of cities around the world in celebrating Earth Hour.
The star on Borovitskaya tower shines as lights are turned off at the Kremlin during the worldwide Earth Hour in Moscow, Russia.
The lights are turned off at the Kremlin during the worldwide Earth Hour in Moscow, Russia.
At 8.30 pm on Saturday, Chhatrapati Shivaji Terminus swtiched off its lights to mark Earth Hour in Mumbai on Saturday.
Bollywood actress Hrishita Bhatt holds a solar lamp along with others during the global Earth Hour in Mumbai.
Volunteers hold candles during the global Earth Hour in Bhopal on Saturday.
A view of the Rashtrapati Bhawan during the global Earth Hour in New Delhi on Saturday.
Filipinos, wearing luminous shirts and bracelets, dance the Zumba.
Filipinos, wearing luminous shirts and bracelets, dance the Zumba during the Earth Hour.
A Filipino environmentalist, wearing luminous bracelets, dances the Zumba during the Earth Hour in Manila, Philippines.
Earth Hour, participated in by more than 7,000 cities and townships worldwide, urges households and citizens to switch off their electricity for one hour to help reduce Carbon emissions to help save planet Earth.
Performers wearing luminous costumes forming the words "Earth Hour" as they entertain the crowd during the Earth Hour at Quezon city northeast of Manila, Philippines.
The Indian Presidential Palace stands in darkness after lights were turned out for one hour to mark Earth Hour in New Delhi.
Temple of Dawn is seen moments after its lights are turned off for Earth Hour 2015 in Bangkok, Thailand.
Eriko Ukimura plays the violin during the "Earth Hour" in Tokyo on Saturday.