The lighting of candles during Earth Hour 2013 in Pakistan.

Image: WWF Pakistan

60+ in the Maldives for Earth Hour 2013.

Image: Gili Lankan Fushi

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Just 75 days to go until the world again unites to protect the planet. Reblog if you’re joining us again in 2013 for Earth Hour. (Image WWF-UK/ Geoff Wilson)

Just 3 months to go.

The Egypt skyline showing The Sphinx and The Pyramids are seen after the lights are switched off for Earth Hour on March 27, 2010 in Cairo, Egypt. Image © Jason Larkin

Berlin, Germany during Earth Hour 2011. (Image - Andreas Eistert)

The latest images from #YourPlanet - submissions by @ingridmariemh (Norway) @rkarlts (Indonesia), @samerghabra (Lebanon), @purpleosh (USA), @lillbabbs (Norway), @oxaudo (USA), @carozcorner (Norway), @skamankee (Alaska, USA), @ninasfoto11 (Elephant Eye), @khristway (Indonesia)

An African elephant stands in front of a double rainbow in Maasai Mara Game Reserve, Kenya. Today is World Elephant Day, so let’s share the hope that we can stop the illegal wildlife trade. (Image © naturepl.com/Andy Rouse/WWF-Canon)

A satellite image of a phytoplankton bloom stretching across the Barents Sea off the coast of mainland Europe’s most northern point, Cape Nordkinn. Free-floating phytoplankton highlight the whirls of ocean currents in spectacular shades of blue and green. These microscopic marine organisms that drift on or near the surface of oceans and seas have been called ‘the grass of the sea’ beca…use they are the foundation of the oceanic food chain. Phytoplankton are able to convert inorganic compounds such as water, nitrogen and carbon into complex organic materials. With their ability to ‘digest’ these compounds, they are credited with removing as much carbon dioxide from the atmosphere as their plant ‘cousins’ on land - therefore having a profound influence on climate. They are also sensitive to environmental changes, so it is important to monitor and model phytoplankton into calculations of future climate change. This image was released as part of WWF’s 2012 Living Planet Report © ESA

A satellite image of the Canary Islands with unique cloud formations, created by ‘Von Karman vortices’, off the coast of Africa (right) in the Atlantic Ocean. These vortices, named after aeronautical engineer Theodore von Karman, form as air flows around an object in its path, causing it to separate and create eddies in its wake. The clockwise and counter-clockwise spirals in this image were created as wind blowing from the north over the Atlantic was disturbed by the archipelago. The islands are (left to right): El Hierro, La Palma, La Gomera, Tenerife, Gran Canaria, Fuerteventura and Lanzarote. © ESA

The Amazon rainforest as seen from space - this image was shared exclusively with the Earth Hour community as Hora Do Planeta hit Brazil on March 31. This year, the Rio+20 Earth Summit will take place between 20 - 22 June 2012, focusing on sustainable development poverty eradication; and the institutional framework for sustainable development. Greenpeace International Exectutive Director Kumi Naidoo will dye his beard green for Rio+20 because 10,000 people accepted his IWIYW challenge to support Earth Hour. (Image ESA/NASA)

As Earth Hour made its way across the Middle East, we shared this exclusive image of the fertile Nile River in Egypt as seen from space. Andre Kuipers observed Earth Hour from the International Space Station for the first time in 2012. The images of our planet were shown over the Earth Hour weekend to give some perspective as to what it is we’re trying to save by going beyond the hour each year. Isn’t our world beautiful? (Image ESA/NASA)

London Calling

Big Ben and the British Houses of Parliament switch off for Earth Hour 2012

(Image Geoff Wilson/WWF UK)