The competitive cost of wind has made it the second-largest source of new electric power generation in the U.S. for the past three years, behind natural gas and ahead of coal.

风力极具竞争力的价格使得它在过去3年间成为美国第二大新一代电力来源，排名第一和第三的分别是天然气和煤炭。

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Heating boiler is a kind of commonly used boiler, which USES coal, fuel oil, gas, power and other fuels as heating source.

采暖锅炉是一种常用的锅炉，它以煤、燃油、燃气、动力电等燃料为加热源。

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In northern Songliao basin there exist biogas, oil type gas, coal type gas and organic deep source gas.

松辽盆地北部天然气类型包括生物气、油型气、煤型气和有机深源气。

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The proposal lumps gas turbines and coal boilers into the same source category, and it holds coal power plants to a CO2 performance standard that nearly all natural gas combined cycle plants and exactly zero commercial coal power plants can meet.

FORBES: EPA Nominee Gina McCarthy Has A History Of Misleading Congress

China is already investing billions of dollars to substitute hydropower (which counts as a renewable energy source) for coal and gas in electricity generation.

FORBES: Pollution And Prosperity

While solar is a far less polluting energy source than coal or natural gas, many panel makers are nevertheless grappling with a hazardous waste problem.

NPR: Solar Industry Grapples With Hazardous Wastes