This image of light infiltration in the Alps was shared with the Earth Hour community on March 31, as the hour of inspiration made its way across Europe. André Kuipers observed the lights going off from the International Space Station. Earth Hour 2012 took place in 152 countries and territories and nearly 7000 cities and towns - the biggest growth for the campaign since 2009. This is our planet - what are you willing to do to protect it? (Image ESA/NASA)

Earth Hour China

Photos from Lights Out Great Wall of China

Credit: WWF China

Earth Hour Indonesia

Photos from around major cities

Credit: WWF Indonesia

Earth Hour Australia

Photos from Sydney lights out event

Credit: WWF Australia

Use energy saving bulbs in daily life.

Let’s go beyond the hour and set an energy saving target.

Via Earth Hour Hong kong

Flickr Countdown to Earth Hour

19 days to go

Indonesia

Beyond the Hour - 60+ firelight sign for Earth Hour 2011 in Bandung, Indonesia. This image is also the official Earth Hour Facebook Timeline Cover.

 © WWF/Jody Spectrum