The Great Wall of China took part in this year's Earth Hour. Everyone around the world is asked to turn off lights for an hour from 8.30pm local time as a show of support for tougher action to confront climate change.
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It has a wingspan of 79ft and can fly non-stop for more than 40 hours.
Full blown blue skies
David Lidington warned that Brussels institutions could be putting their own citizens at greater risk of attack.