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Swedish 15-year-old girl Greta Thunberg holds a placard reading "School strike for the climate" during a protest against climate change outside the Swedish parliament on November 30, 2018. - In more than hundred cities across Sweden, environmentalists have organised protests, partly inspired by Greta Thunberg, who strikes every Friday against climate change outside the parliament since several months. UN's annual climate talks which this year will take place in Poland starts on December 2, 2018. (Photo by Hanna FRANZEN / TT News Agency / AFP) / Sweden OUT (Photo credit should read HANNA FRANZEN/AFP/Getty Images)

Swedish 15-year-old girl Greta Thunberg holds a placard reading "School strike for the climate" during a protest against climate change outside the Swedish parliament on November 30, 2018. - In more than hundred cities across Sweden, environmentalists have organised protests, partly inspired by Greta Thunberg, who strikes every Friday against climate change outside the parliament since several months. UN's annual climate talks which this year will take place in Poland starts on December 2, 2018. (Photo by Hanna FRANZEN / TT News Agency / AFP) / Sweden OUT (Photo credit should read HANNA FRANZEN/AFP/Getty Images)
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AFP HANNA FRANZEN

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A student holds a placard reading "There's no planet B" during the "Fridays For Future" movement on a global day of student protests aiming to spark world leaders into action on climate change, in Madrid on March 15, 2019 - The worldwide protests were inspired by Swedish teen activist Greta Thunberg, who camped out in front of parliament in Stockholm last year to demand action from world leaders on global warming. (Photo by OSCAR DEL POZO / AFP) (Photo credit should read OSCAR DEL POZO/AFP/Getty Images)

A student holds a placard reading "There's no planet B" during the "Fridays For Future" movement on a global day of student protests aiming to spark world leaders into action on climate change, in Madrid on March 15, 2019 - The worldwide protests were inspired by Swedish teen activist Greta Thunberg, who camped out in front of parliament in Stockholm last year to demand action from world leaders on global warming. (Photo by OSCAR DEL POZO / AFP) (Photo credit should read OSCAR DEL POZO/AFP/Getty Images)
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AFP OSCAR DEL POZO

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Young demonstrators carry a banner and hold placards as they participate in a protest against climate change in Athens, on a global day of student protests aiming to push world leaders into action on climate change, on March 15, 2019. - The worldwide protests were inspired by Swedish teen activist Greta Thunberg, who camped out in front of parliament in Stockholm last year to demand action from world leaders on global warming. (Photo by Louisa GOULIAMAKI / AFP) (Photo credit should read LOUISA GOULIAMAKI/AFP/Getty Images)

Young demonstrators carry a banner and hold placards as they participate in a protest against climate change in Athens, on a global day of student protests aiming to push world leaders into action on climate change, on March 15, 2019. - The worldwide protests were inspired by Swedish teen activist Greta Thunberg, who camped out in front of parliament in Stockholm last year to demand action from world leaders on global warming. (Photo by Louisa GOULIAMAKI / AFP) (Photo credit should read LOUISA GOULIAMAKI/AFP/Getty Images)
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AFP LOUISA GOULIAMAKI

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TOPSHOT - A protester holds up placard depicting the 16-year-old Swedish climate activist Greta Thunberg during the "Global Strike For Future" demonstration on a global day of student protests aiming to spark world leaders into action on climate change on May 24, 2019 in Stockholm, Sweden. - In a shift since the last European Parliament elections, mainstream parties have adopted climate change as a rallying cry -- spurred in part by a wave of student strikes. A Eurobarometer poll shows climate change is now a leading concern for European Union voters, not far behind economic issues and rivalling worries about migration. (Photo by Jonathan NACKSTRAND / AFP) (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)

TOPSHOT - A protester holds up placard depicting the 16-year-old Swedish climate activist Greta Thunberg during the "Global Strike For Future" demonstration on a global day of student protests aiming to spark world leaders into action on climate change on May 24, 2019 in Stockholm, Sweden. - In a shift since the last European Parliament elections, mainstream parties have adopted climate change as a rallying cry -- spurred in part by a wave of student strikes. A Eurobarometer poll shows climate change is now a leading concern for European Union voters, not far behind economic issues and rivalling worries about migration. (Photo by Jonathan NACKSTRAND / AFP) (Photo credit should read JONATHAN NACKSTRAND/AFP/Getty Images)
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AFP JONATHAN NACKSTRAND