A picture of Swedish environment activist Greta Thunberg is projected on a screen as Juliana Strassacapa (L), singer of the Brazilian band 'Francisco, El Hombre' and Catalina Garcia (R), singer of the Colombian band 'Monsieur Perine', sing during their joint-performance at the Rock in Rio festival at the Olympic Park, Rio de Janeiro, Brazil, on October 03, 2019. - The week-long Rock in Rio festival started September 27, with international stars as headliners, over 700,000 spectators and social actions including the preservation of the Amazon. (Photo by MAURO PIMENTEL / AFP)