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"China also needs to accumulate more technologies and practical solutions to produce batteries for electric vehicles in a cheaper way and handle old batteries in a sustainable way," he said.

"Can we at least sit down and see each other face to face, and then we can begin to lay out a map, a road map, of what we might be willing to work towards," Tillerson said, changing the tough tone long being held by the Trump administration and suggesting some initial contacts to set the ground rules for further negotiations.

"But perhaps Europe should first pay its fair share of NATO, which the US subsidizes greatly!" he said.

"China never pursues a trade surplus with any country, and the rapid development of Sino-US economic and trade ties over the past decades since the establishment of their diplomatic ties has proved that their cooperation is highly complementary and relatively balanced," the premier said.

"China is probably the only country able to host such an event," said Roger Kornberg, a biochemist from the United States who won the Nobel Prize in chemistry in 2006 and addressed the forum via video link. "The challenges of bringing together 137 laureates of various prizes as well as a very large number of other participants and young people is a logistical nightmare and really almost impossible to accomplish. And yet, the leaders of this effort in China have succeeded and done a brilliant job."