The world is observing Earth Hour on Friday during which everyone is instructed to switch off their lights for an hour as a step towards climate change issue.
This year it is being celebrated on Saturday from 8:30 to 9:30 pm.
Various significant landmarks went dark in order to mark the Earth Hour including, Sydney's Opera House and Habour Bridge, Kuala Lumpur's Petronas Towers, as well as the famous harbour skylines of Hong Kong and Singapore, Beijing's Bird's Nest Olympic stadium, the Eiffel Tower in Paris, the Pyramids of Egypt and New York's Empire State Building.
India also plunged in the celebration by switching off the lights at Delhi's India Gate and Shivaji Maharaj Terminus building in Mumbai.
Began from Australia in 2007, Earth hour is a world's largest movement for the environment where citizens around the world switch off their non-essential lights for an hour as a symbol of commitment to the planet.
This global initiative is organised by World Wide Fund for Nature India, during which reports say millions of supporters from 187 countries have participated.
The campaign includes taking steps like giving up single-use plastics, giving up fossil fuels, giving up lonely car rides for your employees, give up e-waste among others.
This year WWF-India launched an initiative "Give Up to Give Back" to inspire individuals to make little changes in their habits and lifestyle to that burden environment.