U.S. Treasury Secretary Steven Mnuchin told Greta Thunberg she should study economics on Thursday, 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. Mnuchin’s quip came two days after Trump and Thunberg sparred indirectly at the World Economic Forum in the Swiss ski resort. After Trump said the U.S. had committed to joining the one trillion tree initiative, Thunberg retorted that fixing the climate crisis was not only about trees.
