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.
千万年以来，人类的主要燃料是木头，燃烧木头的过程中，碳和氢的比率是10比1。相比较而言，煤在燃烧过程中这个比率是2比1，而石油的比率则是1比2。
Humanity's main fuel for eons was wood, which has a carbon-to-hydrogen ratio of 10 to 1 when burned; by comparison, that ratio is 2 to 1 for coal and 1 to 2 for oil.
传统燃料引起的健康问题已获得深入研究，它们通常都是由燃烧过程中产生的煤烟微粒以及其他污染引发的；
The health problems caused by conventional fuels are well studied and stem from soot particles and other pollution produced when they are burned.
应用推荐