在全国28个产煤统计单位中，有26个单位煤矿事故死亡人数在控制指标进度目标以内，占92.9%。
In 26 (92.9%) out of the 28 coal-producing statistical units nationwide, the number of fatalities in accidents at coal mines fell within the time-adjusted quota.
煤的单位能量含量低于石油和天然气，而且会导致包括酸雨在内的一系列环境问题。
Coal contains less energy per unit of weight than weight than natural gas or oil; it is difficult to transport, and it is associated with a host of environmental issues, among them acid rain.
为了满足这一需求，公用事业单位购买稳定可用的电能总是会选择大规模而廉价的煤电厂和核电厂，它们才是电网的支柱。
To meet that need, utilities buy consistent always-on power from the large, cheap coal and nuclear power plants that are the backbone of the electric grid.
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