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Climate activist Greta Thunberg holds a sign reading 'School strike for the climate' after arriving in Lisbon, aboard the sailboat La Vagabonde, Tuesday, Dec 3, 2019. 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/Armando Franca)