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BRUSSELS, BELGIUM - FEBRUARY 21: (L-R) Climate activits Kyra Gantois, leader of "Youth for Climat" Greta Thunberg, Adelaide Charlier and Luisa Neubauer adresse the European Commission during Civil Society for rEUnaissance (rebirth) event on February 21, 2019 in Brussels, Belgium. (Photo by Sylvain Lefevre/Getty Images)

BRUSSELS, BELGIUM - FEBRUARY 21: (L-R) Climate activits Kyra Gantois, leader of "Youth for Climat" Greta Thunberg,  Adelaide Charlier and Luisa Neubauer adresse the European Commission during Civil Society for rEUnaissance (rebirth) event on February 21, 2019 in Brussels, Belgium. (Photo by Sylvain Lefevre/Getty Images)