Lights out at 8:30pm across the world

Earth Hour is a global action against climate change.

It started in Australia in 2007 and it has grown to a global day of action. Last year 135 countries across every continent took part.

Organisers hope this year will be even more successful.

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Lights go out for Earth Hour

Hundred's of landmarks around the world will switch off their lights at 8.30pm local time as part of a global effort to shine a spotlight on climate change