US President Donald Trump and Swedish ecological activist Greta Thunberg, two irreconcilable eco-rivals, were given the opportunity and venue to duel it out over climate change.
Climate champion Greta Thunberg has motivated a new generation of activists to come to Davos and make their voices heard.
The US President and Greta have been involved in a tit for tat since past year.
The teenage activist called for world leaders to "start listening to the science", urging them to "treat this crisis with the importance it deserves".
Trump's speech was criticized by the Nobel prize-winning economist Joseph Stiglitz for failing to address the climate emergency beyond a commitment that the USA will join the initiative to plant a trillion trees worldwide.
While "Trump is right [that] this is a time for both optimism and action", John E. Morton, a nonresident senior fellow with the Atlantic Council's Global Energy Center, said, Trump "is wrong to suggest that the future lies in fossil fuels". I did not... I think that some people are... they put it in a level that is unrealistic to a point you can't live your lives. The president tweeted last month that Thunberg was "so ridiculous".
It prompted a dry response from Ms Thunberg, who then changed her Twitter caption to read: "A teenager working on her anger management problem. Now chilling and watching a good old fashioned movie with a friend".
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Trump would be forced to leave office if convicted, but the Republican-controlled Senate is expected to acquit him. In his address, Mr Trump mostly avoided environmental issues, instead talking up the United States economy.
"I'm not a person that can complain about not being heard", she said, prompting laughter from the audience on the first day of the annual WEF meeting.
"As if what we are seeing with our eyes are not there", Mr Stiglitz said.
He attended the event despite his impeachment trial in the United States getting underway today.
"While this year's forum is focused on how businesses must change to save the planet, ".
The Phase 1 agreement eases some sanctions on China while Beijing has agreed to step up its purchases of US farm products and other goods.
The U.S. struck a Phase 1 trade deal with China in January, soothing some of the worries which have hampered the world economy in recent times.
In the past, the president has characterized the world's largest single market as a "foe" that has taken advantage of the American economy.
"The Fed raised rates too quickly and has lowered them too slowly", he said.