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STROMSTAD, SWEDEN - AUGUST 22: Crown Princess Victoria of Sweden and Crown Princess Mette-Marit of Norway take part in Climate Pilgrimage on August 22, 2015 in Stromstad, Sweden. (Photo by Ragnar Singsaas/Getty Images)

STROMSTAD, SWEDEN - AUGUST 22: Crown Princess Victoria of Sweden and Crown Princess Mette-Marit of Norway take part in Climate Pilgrimage on August 22, 2015 in Stromstad, Sweden.  (Photo by Ragnar Singsaas/Getty Images)