A photograph of a smiling Prince Charles cuddling his grandson Prince George has appeared for the first time in a video made by the Prince of Wales to promote climate change awareness.

The picture can be seen in the bottom left hand corner of the screen as the Prince delivers a video message in support of Earth Hour.

Charles will become a grandfather for the second time this spring, when his daughter-in-law the Duchess of Cambridge gives birth to George's younger brother or sister.

Some of the world's most famous landmarks were plunged into darkness on Saturday evening as millions of people around the world switched off their lights for an hour to raise awareness about climate change.

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Buckingham Palace, London's Tower Bridge, Old Trafford football stadium and Big Ben, were just some of the buildings taking part in the WWF's Earth Hour.

The event, which traditionally takes place at 8.30pm local time in cities around the world, saw more than 700 landmarks switch off their lights, including St Peter's in the Vatican, France's Eiffel Tower and more than 30 Unesco World Heritage Sites.

Earth Hour was launched in 2007 in Australia and has since spread around the world.

Last year nine million people in the UK took part as part of a record-breaking chain of 162 countries.