As reported by Reuters, he specifically called out the "perennial prophets of doom," and referred to climate change activists as "heirs of yesterday's foolish fortune tellers."
In her address, Thunberg said that planting trees would not be enough and responded to Trump with a rebuke for inaction on climate change.
"Our house is still on fire," she said, referring to her remarks a year earlier in Davos. "Your inaction is fuelling the flames....Planting trees is good of course, but it is nowhere near enough of what is needed, and it cannot replace real mitigation and rewilding nature."