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Dimming out for Mother Earth

During last Saturday’s Earth Hour, homes, office towers and landmarks around the world turned off their lights from 8.30 pm local time, for an hour, to raise awareness about climate change and the threat from rising greenhouse gas emissions. Buildings in some 4,000 cities in more than 120 countries unplugged to reduce energy consumption.

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This image released by the Nasa Earth Observatory of the Earth’s city lights was created with data from the Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS). Originally designed to view clouds by moonlight, the OLS is also used to map the locations of permanent lights on the Earth’s surface. The brightest areas of the Earth are the most urbanized, but not necessarily the most populated.

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A combo shows the Eiffel tower submerging into darkness at 8:30 pm (local time) in Paris as part of the Earth Hour switch-off.

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People light candles during Earth Hour in Cancun.

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Glasses containing candles form the number 60 in celebration of Earth Hour in La Paz.

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Jordanians hold candles, as they gather to mark 'earth hour' in Amman, Jordan.

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In this combo picture, a view of Malaysia's landmark Patronas Twin Towers is seen before (L) and during lights out (R) for Earth Hour in Kuala Lumpur.

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A fire acrobat performs in front of the Bulgarian National Theatre, with lights turned off as part of Earth Hour in Sofia.

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A man lights candles during Earth Hour by the West lake in Hanoi

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A newly married couple Ruchita and Vishvas Sawant participate in candle light rally for Earth, in Mumbai, India.

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An Indian family eats under candlelight at a restaurant in observance of Earth Hour in Amritsar, India.

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Emirati girls stand next to mascots Spark and Splash during the Earth Hour lantern march in Dubai. Hundreds of people, from white-robed Emiratis to foreigners in shorts, marched with small lanterns to mark Earth Hour, as the lights went out in some of Dubai's landmarks and most iconic buildings.

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A Pakistani boy holds a candle in front of the national assembly in Islamabad.