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By October 2020, the coking industry in Hebei will complete advanced treatment to achieve the lowest emission standard.

By 2018, China had 249 million people aged 60 and above, accounting for 17.9 percent of its total population, becoming a country with the largest and fastest-growing aged population in the world.

But whether the gas can provide a silver bullet depends a lot on future technological innovations, not least because most currently available methods for producing ammonia themselves emit carbon dioxide.

By July 4, a total of 25 companies have had their initial public offering registration approved by the China Securities Regulatory Commission. They will be the first number of listed companies at the technology-focused board, said the Shanghai bourse.

But to provide continuity, they each expect to serve on one or both of the boards of the two companies.