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MONACO - NOVEMBER 29: In This Handout Provided by Monaco Press Center, Prince Albert of Monaco and Princess Charlene of Monaco walk with their twins Princess Gabriella of Monaco and Prince Jacques of Monaco during the 'March for climate' on November 29, 2015 in Monaco, Monaco. (Photo by Gaetan Luci /Monaco Press Center via Getty Images)

MONACO - NOVEMBER 29: In This Handout Provided by Monaco Press Center, Prince Albert of Monaco and Princess Charlene of Monaco walk with their twins Princess Gabriella of Monaco and Prince Jacques of Monaco during the 'March for climate' on November 29, 2015 in Monaco, Monaco. (Photo by Gaetan Luci /Monaco Press Center via Getty Images)