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Bikeplus director Antonia Roberts estimates ride fares account for around one third of an operator's income.

Bolivia relies heavily on the mining and sales of natural gas, but a sharp decline in those exports to its main buyers in the region and the plunge in international prices of oil and gas have created challenges.

BloombergNEF expects oil demand in China to remain healthy in the second half of this year.

Big data, 5G, cloud computing, industrial internet, artificial intelligence, block chain and other emerging technologies will inject new vitality to the economic growth in China. But they will also bring new risks, challenges and uncertainties, Zhao said.

Biomass is often burned to generate power rather than being decomposed into biogas in China. Even though, in 2017, the installed power capacity of renewables in China reached a record 650 million kilowatts, accounting for about 36 percent of installed power capacity in the country, biomass capacity took up only 2 percent of renewables, according to Chen.