本货物的范围包括：天然沼气和人工生产的沼气。
The scope of this kind of goods include natural marsh gas and artificially made methane.
天然气和沼气燃烧时，都会产生二氧化碳，但是要比煤和石油少得多。
Both natural gas and biogas create emissions when burned, but far less than coal and oil do.
目前Bloom boxes使用天然气、乙醇或者沼气来运行燃料电池。
The current generation of Bloom boxes use natural gas, ethanol or biogas to run their fuel cells.
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