机译：Natural gas is a high-quality,high-efficiency,clean and low-carbon energy.The CO2 produced by its combustion accounts for only 55%of the combustion of coal and 80%of the combustion of petroleum.Natural gas combustion is almost free of sulfur,dust and other harmful substances,thus natural gas can form a benign complement with lowemission and renewable energy,such as electricity,which is an appropriate choice for urban clean energy supply(Ma,2017).A green smart city is composed of subsystems of organization(people),business/govemment affairs,transportation,communication,water and clean energy,among which a clean energy supply subsystem should be green,low carbon,safe,efficient,smart and friendly(Liu and Wang,2017).Natural gas can be used in residences,commerce,public utilities,distributed energy,and other fields in smart cities.
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