Environmental activist Thunberg rejected US Treasury Secretary Mnuchin after he advised her to go to school before speaking about the environment.

"It is not necessary to have an economic university degree to be aware of the carbon we have left and realize the absurdity of continuing subsidies and investments in fossil energy," Greta Thunberg posted on Twitter on Monday. 1, in response to US Treasury Secretary Steven Mnuchin.

Mnuchin earlier told reporters at the World Economic Forum in Davos, Switzerland, that Thunberg should study economics at university and return to explain her remarks about fossil energy.

"Is she an economist? Who is she? I don't understand," the US Treasury Secretary said, but later confirmed he was "joking".

The administration of US President Donald Trump and environmental activist Greta Thungberg have been discussing indirectly since January 21 during a discussion session in Davos, but the organizers have sought to help avoid a confrontation between the two sides. .

Thunberg harshly criticized US policy at the World Economic Forum, while Trump on January 21 made sarcastic remarks about "apocalyptic prophets" and "predictions of perdition". Thunberg was now sitting in the audience seat.

Greta Thunberg became famous globally after dropping out of school to work in the environment. The "Friday for the Future" movement spread to many countries, involving millions of students.

Many people supported Thunberg, but there were many ideas that her message was extreme and caused confusion. World leaders like Trump and Putin also disapprove of her actions, saying she thought it was "too simple".