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"Direct use of coal and other energy sources will naturally decrease in the final energy consumption mix, as human society develops and relies more on electricity," Lin said.

"Federal aid can help, but it's a bit like keeping a patient on dialysis－debilitated and never able to be self-reliant," Dandapani said.

"Economic history clearly shows that trade wars not only hurt global growth, but they are also unwinnable," said Lagarde.

"Don't forget, human beings are the creators of AI," he said. "So human beings are responsible for putting AI in good service and letting it play a good role."

"Despite the economic impact of the novel coronavirus outbreak, we remain optimistic on business prospects as marketing demand is still going strong in China," he said, adding that future advertising will be more targeted and backed by technological tools including digital media like livestreaming and short videos. It will also focus more on returns－promoting sales, brand awareness and reputation-building campaigns.