LVMH Chairman Bernard Arnault had some critical words for teenage environmental activist Greta Thunberg when he spoke at the luxury giant’s sustainability event in Paris.

“She’s a dynamic young girl, but she’s surrendering completely to catastrophism,” Arnault, France’s richest man, said Wednesday. “I find that her views are demoralizing for young people.”

The remarks from Arnault, 70, came two days after the 16-year-old Thunberg scolded heads of state at a United Nations summit in New York for doing too little to fight global warming. “We are at the…