The protest is taking place ahead of the upcoming annual gathering of world leaders at the Davos World Economic Forum.
Trump didn't address Thunberg by name when he spoke at Davos earlier this week, though he did call for the rejection of "the perennial prophets of doom and their predictions of the apocalypse". He also branded Chinese President Xi Jinping and Prime Minister Viktor Orban of Soros' native Hungary as dictators.
"Our working assumption is that it will not fail and that we will make a deal with them", Ross said, referring to the EU.
It comes after Mr Trump unilaterally pledged to withdraw the USA from the Paris Climate Accord , which aims to cut Carbon dioxide emissions to a rate that will limit global warming to 1.5C.
Ms Thunberg's call for urgent climate action was, he said, "unrealistic to a point you can't live your lives".
"When we are clean and attractive and everything's good, but you have another continent where the fumes are rising at levels that you can't believe, I think Greta ought to focus on those places", the president expressed.
I wonder what will you tell your children was the reason to fail and leave them facing a climate chaos that you knowingly brought upon them.
President Donald Trump set a presidential activity record on his favorite social media platform on Wednesday, tweeting and retweeting at length about the Senate recall trial, the Democrats who want to replace it and much more.
Addressing the Trump administration's stance on climate, Mnuchin said the US position had been "misunderstood". "We want to have the cleanest water on Earth, we want to have the cleanest air on Earth", he proclaimed.
Trump simply stated that he "will continue to show strong leadership in restoring, growing and better managing our trees and our forests", not specifying the details on how the US would participate in the initiative.
Charles said: 'Critically, we must foster innovation - and here I would like to acknowledge the new Earthshot initiative of my son... which we need to give us hope'.