LONDON, ENGLAND - DECEMBER 25: Queen Elizabeth II sits at a desk in the 18th Century Room at Buckingham Palace, after recording her Christmas Day broadcast to the Commonwealth on December 25, 2015 in London, England. (Photo by John Stillwell-WPA Pool/Getty Images)

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Models painted in camouflage colors to blend in with the background pose for Chinese artist Liu Bolin's artwork "Dongji", or Winter Solstice, on the second day after China's capital Beijing issued its second ever "red alert" for air pollution, in Beijing, China, December 20, 2015. In this artwork, Liu wants to express his concerns about China and its people, including air pollution problem, Liu told Reuters. REUTERS/Kim Kyung-Hoon

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