U.S. Treasury Secretary Steve Mnuchin suggested that Greta Thunberg isn’t the best person to give advice on economic issues related to climate change — at least not until she goes to college. At a press briefing at the World Economic Forum in Davos, Mnuchin criticized the 17-year-old environmental activist’s call to divest from fossil fuels immediately, according to the Associated Press. Asked how such restrictions would affect the U.S.