Lights out for WWF’s Earth Hour

Activists of the World Wide Fund For Nature (WWF) spell out the words Earth Hour 2014 in front of the unlit Brandenburg gate to mark Earth Hour in Berlin, Saturday, March 29, 2014. Earth Hour is marked around the world, with millions expected to turn out the lights to raise awareness about climate change. (AP Photo/Markus Schreiber)
Activists of the World Wide Fund For Nature (WWF) spell out the words Earth Hour 2014 in front of the unlit Brandenburg gate to mark Earth Hour in Berlin, Saturday, March 29, 2014. Earth Hour is marked around the world, with millions expected to turn out the lights to raise awareness about climate change. (AP Photo/Markus Schreiber)

NEW YORK (CNN) – Lights out! Millions of people across the world are expected to turn off the lights for one hour Saturday.

The “World Wide Fund for Nature” encourages people, cities, businesses and landmarks to switch off the lights at 8:30pm local time. The annual earth hour started in 2007 and is aimed at showing support for environmental causes.

Famous landmarks expected to turn off the lights include New York City’s Empire State Building, Berlin’s Brandenburg Gate and the Eiffel Tower in Paris. Others include the houses of parliament and Buckingham Palace in England, and many others. USA Today estimates more than a billion people take part.

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