Chris Hadfield to photograph planet during Earth Hour

Commander Chris Hadfield, the astronaut currently living aboard the International Space Station, has tweeted that he will be photographing people's efforts during Earth Hour later today.

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Good Morning, Earth! I'll try and photograph people's efforts during Eartrh Hour today. It's our planet, let's each help a bit.

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Planet goes dark for Earth Hour

People across the world switched off their lights last night in support of a global effort to tackle climate change.