Over the past two decades the Global Fund has fought the spread of AIDS, tuberculosis and malaria, but now many in the field fear its progress is under threat. The founder and CEO of language-learning app Duolingo, Luis von Ahn, on his plans to help the 750m illiterate adults in the world learn to read. And, why net-zero carbon emissions targets are measuring the wrong thing. Kenneth Cukier hosts For information regarding your data privacy, visit acast.com/privacy

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