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.
More top news
European Union leaders are attending a special summit later to formally agree their Brexit negotiating strategy.
Most places across the UK will stay dry all day, with sunny spells, particularly in the south.
The Royal Marine jailed for killing an injured Taliban fighter in Afghanistan has spoken for the first time since being released from jail.