Today however, the most economical way to make hydrogen is by reforming fossil fuels such as natural gas—with the nearly same negative impact to the climate as direct combustion.

然而今天，制备氢气最经济的方法是通过重整如天然气之类的化石燃料，天然气直接燃烧对环境有同样的负面影响。

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The natural gas combustion and utilization process is evaluated based on the optimized simulation.

在优化模拟的基础上对天然气燃烧利用过程进行了评估。

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Compared with other natural gas combustor, this combustor can generate the second combustion and form circumfluence of smoke.

同一般天然气燃烧器相比，这种燃烧器既能产生二段燃烧，又能促进一定量的烟气回流。

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Consider that for every BTU of coal or natural gas burned in a combustion turbine only 35 percent of that is converted into useful power.

FORBES: Recycling Wasted Heat and Power Could Clear the Air

Most of this decrease was due directly to the decreasing use of coal in power plants and the increase in combustion of clean-burning natural gas.

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But coal mining and combustion produces health and environmental risks that dwarf those associated with natural-gas production.

WSJ: Should Fracking Be Regulated by the Feds or the States?