Back-and-forths between the teenager and the 73-year-old president have dominated the first two days of the annual gathering of the world's business and political elite, as both have attempted to frame climate change.
Over the past year, Thunberg has taken issue with many aspects of USA policy, not least President Donald Trump's decision to pull the country out of the Paris accord to limit global warming.
In her address Greta Thunberg called on world leaders to abandon fossil fuels in order to "save the world".
Charles has always been ahead of the crowd when it comes to environmental awareness.
The Prince also told how his sons, the Duke of Cambridge and Duke of Sussex, and grandchildren Prince George, Princess Charlotte, Prince Louis, and baby Archie have been in his mind when he's campaigning for the environment.
And Joe Kaeser, the chief executive of German giant Siemens, told Reuters he had advised Trump to listen to young activists.
YouTube TV comes to PS4 as PS Vue moves out
It now costs $49.99/mo, features 70+ channels, free DVR, local sports and news, and no extra fees beyond that $49.99 price. This makes Google the first third-party company to get a tv subscription service on the PS4.
Will Paul Pogba stay at Manchester United? A decision may be coming
There is only one in life and that is that one day you will die. "I'm not sure if (it will happen) now or the end of the season". Sporting were reportedly willing to part ways with Fernandes for just under $50 million last summer.
Damian Lillard Sets MLK Day Record with 61 Points - ESPN 98.1 FM
Lillard's previous occupation excessive was 60 aspects earlier this season in opposition to the Brooklyn Nets . Thompson's return this season is uncertain while he rehabs from the ACL injury he sustained in the NBA Finals.
He said he did not want to be accused by his descendants of doing nothing "except prevaricate and deny the problem".
Thunberg said in September that talking to Trump at the U.N. General Assembly in New York City would have been a waste of time.
Ukraine's prime minister says he is "not planning to go anywhere", trying to tamp down "rumors" that he or his government might soon resign.
Both Greta and the heir to the United Kingdom throne gave speeches, with Greta joining other young climate activists to speak to world leaders on Tuesday.
He said he thought Thunberg should shift her attention away from the United States to focus on other, more polluted countries. "I think Greta ought to focus on those places", he said.
"There are those who will be out front in the transition and those who lag".