Prince Harry honored the late South African leader Nelson Mandela and called on leaders to take action to address climate change in his keynote speech at the U.N. General Assembly’s annual celebration of Nelson Mandela International Day on Monday. “As we sit here today, our world is on fire again,” Harry said. “These historic weather events are no longer historic. More and more they are part of our daily lives and this crisis will only grow worse unless our leaders lead.”

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