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epa07864369 Greta Thunberg, the 16-years-old climate activist from Sweden, addresses world leaders at the start of the 2019 Climate Action Summit which is being held in advance of the General Debate of the General Assembly of the United Nations at United Nations Headquarters in New York, New York, USA, 23 September 2019. World Leaders have been invited to speak at the event, which was organized by the United Nations Secretary-General Antonio Guterres, for the purpose of proposing plans for addressing global climate change. The General Debate of the 74th session of the UN General Assembly begins on 24 September. EPA/HAYOUNG JEON