This video shows areas around the world turning off their lights for Earth Hour.
Shown in the video are Bangkok, Beijing, Kuala Lumpur, Jakarta, Moscow, Doha and Zagreb.
Landmarks across the UK switched off their lights last night in support of a global effort to tackle climate change.
Elizabeth Tower, which houses Big Ben in the Palace of Westminster, the Southbank Centre for arts on the banks of the River Thames and Buckingham Palace all went dark at 8.30pm for Earth Hour.
Canadian astronaut Commander Chris Hadfield, currently on board the International Space Station, has been tweeting images of major cities prior to Earth Hour.
He wrote, "New York City, lit up like a bulb. The Statue of Liberty is clearly visible in the night from above".
The commander also highlighted that "spiderwebs of light expanding out from the dark river border" could be seen of Detroit and Windsor.
Commander Chris Hadfield, the astronaut currently living aboard the International Space Station, has tweeted that he will be photographing people's efforts during Earth Hour later today.