"Trust me. I've done this before, and I can assure you that it doesn't work".
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'If the United Kingdom and U.S. have very similar economies with a big focus on services, and I think this will be a very important relationship.
In response to Mnuchin's comment on Thursday, Thunberg tweeted a graph from a United Nations report showing how the world's remaining carbon budget will be depleted by 2027 unless global emissions are curbed.
Jennifer Morgan, executive director of Greenpeace International, told AFP during the forum that governments were still failing to act on climate change.
This week, during a press conference at the Davos Economic Forum, Mnuchin jokingly wondered whether the famous 17-year-old eco-activist was "a chief economist" after being asked about Thunberg's call to move away from fossil fuels.
"Just think for a moment, what good is all the extra wealth in the world gained from business as usual if you can do nothing with it except watch it burn in catastrophic conditions". "Let's be clear. We don't need a 'low carbon economy.' We don't need to 'lower emissions.' Our emissions have to stop".
"Here at the WEF we see and hear a lot of nice words and a lot of big speeches, and we expect throughout the next days and weeks and months every single one of those to be turned into action", Neubauer said.
"After she goes and studies economics in college she can come back and explain that to us", Mnuchin said.
The treasury boss said the deal would underline a "very important relationship", cited the importance of Britain being "at the top of the list" to President Trump, and said: "We've said that our goal - your goal - is trying to get both of these trade agreements done this year".
But Thunberg, who was reportedly in attendance during Trump's speech, maintained Tuesday that she has no interest in political tiffs.
Speaking on a panel Friday as the event drew to a close, Lagarde told the audience that central banks needed to lead the economic modeling of how these changes for the environment should come about.
Thunberg is now taking a gap year from school to focus on her activism.