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Climate activist Greta Thunberg waves as she arrives in Lisbon aboard the sailboat La Vagabonde Tuesday, Dec 3, 2019. Climate activist Greta Thunberg has arrived by catamaran in the port of Lisbon after a three-week voyage across the Atlantic Ocean from the United States. The Swedish teen sailed to the Portuguese capital before heading to neighboring Spain to attend the U.N. Climate Change Conference taking place in Madrid. (AP Photo/Pedro Rocha)