The United States' financial chief on Thursday told Swedish teen Greta Thunberg to go study before calling for a fossil fuel halt, prompting the climate campaigner to reply it doesn't "take a degree" to understand the science.

Study economics in college and then explain fossil fuels to us: US Treasury secretary Mnuchin to Greta Thunberg

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Study economics in college and then explain fossil fuels to us: US Treasury secretary Mnuchin to Greta Thunberg