US treasury secretary Steven Mnuchin on Thursday told Greta Thunberg she should study economics, a jibe which prompted the climate activist to say she didn't need a degree to know the world was not meeting its climate targets.

Asked about Thunberg's previous calls to divest from fossil fuels, Mnuchin told a news briefing in Davos: "Is she the chief economist? I'm confused . After she goes and studies economics in college, she can come back and explain that to us."

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