1. John Kerry: World needs to unite on climate action

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    Video caption: US Presidential Climate Envoy John Kerry said that urgent and ambitious action is needed

    With a target of just nine years left to limit global temperature rises to 1.5 degrees, US climate envoy John Kerry said that urgent action was needed.

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    Video caption: The young climate scientists who want their voice heard

    Thousands of young people are joining a mission to help solve the environmental crisis facing their generation.

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    Video caption: Can the world's biggest polluters change their ways?

    The clock is ticking with less than 30 years left to tackle carbon emissions