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    Leonardo DiCaprio introduces three young climate activists

    06:35
  • Highlights from the Global Citizen Festival in South Africa in honor of Mandela

    03:40
  • The sights and sounds of 2018 Global Citizen Festival

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  • Chelsea Handler on GCF and her 'rap flow'

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Demi Lovato: 'Cool for the Summer'

03:32

Demi Lovato performs "Cool for the Summer" in New York City at the Global Citizen Festival.