President Trump responded to an impassioned plea at the United Nations by teenage climate activist Greta Thunberg with a sarcastic late-night tweet.

Said Trump: “She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!”

Trump attached video of Thunberg’s angry remarks to the gathering in New York: “People are suffering, people are dying, entire ecosystems are collapsing. We are in the beginning of a mass extinction, and all you can talk about is money and fairy tales of eternal economic growth.”