The twin children of the Prince and Princess of Monaco, Prince Jacques (R) and Princess Gabriella, are pictured as their parents take part in a 'March for climate' on November 29, 2015 in Monaco, within the start of the UN conference on climate change COP21 that takes place in Paris. Some 150 leaders including will attend the start on November 30 of the UN conference, tasked with reaching the first truly universal climate pact.  / AFP / VALERY HACHE        (Photo credit should read VALERY HACHE/AFP/Getty Images)