Landmarks across the UK switched off their lights last night in support of a global effort to tackle climate change.
Elizabeth Tower, which houses Big Ben in the Palace of Westminster, the Southbank Centre for arts on the banks of the River Thames and Buckingham Palace all went dark at 8.30pm for Earth Hour.
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Even if you're having a tough day in the office, it's unlikely to be as difficult as the one facing the director of the US Secret Service.
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The US Secret Service chief faces questions from politicians today over the latest in a series of worrying White House security breaches.