Lights out in Sydney for Earth Hour conservation campaign

Earth Hour is a global call for the protection of the planet and for people to take a stand against climate change.

The thirteenth edition of Earth Hour, organised by the green group WWF, will see 24 landmarks each go dark for 60 minutes throughout the day.

The world's biggest landmarks - such as the Sydney Opera House, Empire State Building, the Eiffel Tower, Carnaby Street, Buckingham Palace, and Edinburgh Castle - switch off lights as a visual display of their commitment. "And we could be the last that can do anything about it", the charity said.

Top tourist sites in coal-reliant Poland are turning off their lights at 8:30 solidarity with global Earth Hour action calling for better climate protections.

The World Wildlife Fund is asking everyone to turn off their lights for "Earth Hour". "But we are pushing the planet to the limit and nature is severely under threat", said Marco Lambertini, Director General, WWF International.

"Oman has a unique natural diversity, from our mountains and valleys to our lovely coastline, and we really need to do whatever we can to preserve and nurture it", added the spokesperson. Climate change is happening. You can also share your Earth Hour experience on Facebook, Instagram, or Twitter with the hashtag #Connect2Earth. The increased severity of climate change and the staggering loss of biodiversity threaten the planet, and people the world over are urged to take action.

In Hong Kong, major buildings along Victoria Harbour turned off their non-essential lights at 8:30pm, and the city's popular tourist attraction known as the Symphony of Lights was cancelled.

Since then, the movement has grown globally and is now the world's largest grassroots movement for the environment.