Indeed, many experts believe that the future of electricity generation will not come from further refinement of solar, wind, coal or nuclear energy, but from fuel cells.

很多专家认为未来的电能不会来自改良后的太阳能、风能、煤炭或核能，而将来自燃料电池。

youdao

But Dong, like many coal companies, is keen to give the dirtiest fossil fuel a makeover.

不过，东能源公司像其它许多煤炭公司一样，热衷于改造肮脏的矿物燃料。

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And many of these states depend on coal, the dirtiest commonly-used fuel.

在这些州之中又有不少对煤炭——污染最大但使用普遍的燃料——难以割舍。

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Wood and coal for fuel. Technology solved many of the problems.

VOA: special.2010.04.15

Many so-called greenhouse gases, such as carbon dioxide, come from burning fossil fuel such as oil or coal.

VOA: standard.2009.12.16

Many of these resolutions are focused directly on fossil fuel companies like Exxon, coal-fired electric utilities and hydraulic fracturing operators whose practices need cleaning up.

FORBES: Fossil Fuel Divestment Is A Timely Issue For Investors

Not so long ago, Mr. Gore was among the many environmentalists who deemed natural gas the fossil fuel of the future because it emits considerably less CO2 than coal or oil.

FORBES: President Obama's Three-Front War On Energy