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"Half of the Chinese population currently reside in cities and this will only increase in the coming years. It is imperative that China builds smart and sustainable cities that can better manage waste, water, energy, mobility and infrastructure," he said.

"For many, cohabitation is not a substitute for marriage but is a taste of married life to see whether they enjoy it or not. Roughly 60 percent of the survey respondents cohabit for no more than half a year, and then some break up," Shen said.

"Growing contacts among people will promote transmission of the coronavirus," the institute said, adding that factors such as warming summer temperatures won't offset the rising mobility, "thereby fueling a significant increase in projected deaths".

"Having a dialogue at such a venue as the G20 Summit lends support to the multilateral forum, and is an effort to overcome existing difficulties and to give an impetus for further activities of the G20 in order to pursue its goals," Ladjevac added.

"For instance, some products on the market contain stabilizers, but in extremely small amounts. Some business operators consider their products to be food or drinks, which means the products are assessed as such, rather than as medicines, before they go on the market," Peng said.