Treasury Secretary Steven Mnuchin said Greta Thunberg should go away and study economics before lecturing investors on fossil fuels.

Steven Mnuchin said Greta Thunberg’s call for investors to divest fossil fuels showed a lack of understanding about the economy and jobs.

He said at the World Economic Forum in Davos: “After she goes and studies economics in college, she can come back and explain that to us.”

President Donald Trump said that campaigners were too pessimistic and should concentrate their fire on countries where emissions are rising. He did not say which countries.

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On January 23, Steven Mnuchin continued the criticism. In response to a question about Greta Thunberg’s call for fossil fuels to be scrapped, he said: “Is she the chief economist?”

The treasury secretary added: “For people who call for divestment, there are significant economic issues – issues with jobs.”

Greta Thunberg joined other young climate activists to speak to world leaders at the World Economic Forum in Davos on January 21.

The World Economic Forum is a massive event where entrepreneurs, scientists, business leaders and politicians come together to talk about how to tackle world problems.