These reactions increase the probability of incomplete combustion and are more likely to release uncombusted and photochemically active hydrocarbon compounds into the atmosphere.

这些反应增加了不完全燃烧的可能性，更有可能释放未燃尽和光化学活性碳氢化合物到大气中。

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The reverse faults that extend to the surface in some high and steep structural zones can cause pressure release and hydrocarbon emission.

部分高陡构造带上“通天”破裂逆断层出现压力释放和油气大量散失的现象。

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But in the short term, researchers are working on reformers which produce hydrogen aboard vehicles by extracting the gas from methanol or other hydrocarbon fuels -- a process that can release pollutants, though at far lower levels than internal combustion engines, Roan said.

CNN: Bus showcases fuel cell technology

The deal for Mariner is even larger with 181M proven barrels of oil equivalent (47 percent are oil or other hydrocarbon liquids), but according to the press release there is the potential of 2B barrels of oil equivalent among their 50 deepwater prospects.

FORBES: Drilling Into Apache And Mariner