US Treasury Secretary Steven Mnuchin on Thursday advised climate activist Greta Thunberg, who has been bitterly critical of US policy at the World Economic Forum, to study economics before giving out lessons. The Trump administration and Greta Thunberg have sparred indirectly since Tuesday on panels in Davos but organisers have carefully averted any direct confrontation. In a speech on Tuesday, US President Donald Trump castigated the “prophets of doom” and those that predicted a climate “apocalypse”, while Thunberg sat in the audience.
