The Swedish teen sat in on Trump's speech Tuesday to the forum, but that did little to bridge their ideological differences.
"Because as I said I didn't want my grandchildren to accuse me of not doing something about this in time".
She spoke to reporters along with four other young climate activists, before they set off through the streets of Davos for the latest weekly "Fridays for Future" campaign that she launched. Then following a brief pause, he said it was "a joke". "We are being criticised like that all the time".
After a week of discussions at the World Economic Forum that were dominated by how to tackle the biggest problem the planet faces, the last big event of the conference produced a tense exchange between US Treasury Secretary Steven Mnuchin and Christine Lagarde, the president of the European Central Bank.
With European Commission President Ursula von der Leyen focusing her address on the EU's "Green Deal" - a plan to make Europe carbon-neutral by 2050 - and Britain's Prince Charles adding his voice to calls for urgent action, combating global warming was kept at the top of the agenda.
"If we cared about that, we would not be able to do what we do".
She cautioned that while world does not treat, "this crisis as a crisis, and as long as the facts are ignored, we will not solve this crisis".
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Thunberg and her climate advocates have also faced criticism from some longstanding environmental advocates over their tactics, if not necessarily their ambitions.
As the summit wrapped up on Friday, Thunberg lead a protest with young people in the center of Davos, flagging her message to the end, after most world leaders had left.
"We never striked for discourse change", said Neubauer, who this month turned down the offer of a board seat on a subsidiary of German industrial giant Siemens. "But not in an aggressive way".
UN Secretary General Antonio Guterres warned at Davos this year that climate change could leave humanity "doomed".
Asked about Mnuchin's comments, the Swede said: "Of course it has no effect.
We put ourselves in the spotlight", said the activist.