研究者发现，燃料不完全燃烧产生的烟尘，会使发射过程中产生的二氧化碳的排放量减少。
The researchers found that the effect of soot, which is incompletely burned fuel, would dwarf that of the carbon dioxide emissions from the launches.
燃料的不完全燃烧是主要问题。
煤烟通常是燃料不完全燃烧的产物。
Soot is usually the product of the imperfect combustion of fuel.
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