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"Even if we completely decarbonize electricity, we are still going to have CO2 being produced," Cowan said. "We are still going to have cement factories, steel works and breweries. We can either look at CO2 as a waste product, or we can convert this molecule and make it into something useful."

"Experience has shown disparities exist in the enforcement of tobacco control among different areas in China where such regulations have been adopted. In the more developed areas law enforcement is generally better," he said.

"Even though the EU is exempt from the tariffs until May 1, its exports would be impaired significantly by the US measures," said Zhao Zhongxiu, a trade professor at the University of International Business and Economics in Beijing.

"E-commerce is helping rural people to join the digital economy, and some of them even have started their own businesses online," she said.

"Despite China's effective efforts of epidemic control and prevention, the spread of the virus across the globe makes it difficult to predict the magnitude of its impact on both China and the global economy." Gao told a news conference in Beijing, adding that there's tough work ahead.