Waste gases from factories often pollute the air.

从工厂排出来的废气经常污染空气。

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Batch and cullet preheating systems: using furnace waste gases.

配料和碎玻璃预热系统：采用窑炉废气热能。

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They produce waste gases almost as harmful as the gases from factories.

它们排出的废气和工厂排出的废气几乎一样有害。

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Fertilized soil and the burning of crop waste also release harmful gases into the air.

VOA: special.2010.01.05

Like other kinds of trash dumped into landfills, the waste from the Gulf cleanup will eventually decompose, releasing a variety of gases and liquids which are vented or disposed of in turn.

VOA: standard.2010.08.05

But others point out that CCS is able to eliminate CO2 production from industries such as cement and steel, as well as electricity generation, again through absorbing it from waste gases.

BBC: Whatever happened to carbon capture?

As a reporter for the Times noted in her article, the lessons talked about the benefits of coal and the pervasiveness of power plants fueled by it, but omitted mention of the environmental and economic trade-offs, such as toxic waste and greenhouse gases.

FORBES: New York Times Blunders into Advocacy Role on the Fracking Debate -- Children are the Victims

They export large amounts of wastes including household and industrial wastes, waste water and the gases linked with global warming.

BBC: NEWS | Science/Nature | Changing planet revealed in atlas