Around the world, lights were switched off on Saturday night in honour of the 10th Earth Hour.
It's a global initiative organised by WWF, aiming to create aware about responsible resource use and inform people about climate change.
It sees people turn out the lights in a symbolic gesture to save electricity, between 8:30pm and 9:30pm.
In Chile, the lights were turned off at the presidential palace, before a film showing images of the natural world were projected onto the palace's exterior.
Meanwhile in Europe, the lights went out at UK's Tower Bridge, while Italy's Coliseum and France's Eiffel Tower went dark.
Last year saw the most countries take part, at 178.