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.
另外，碳燃料来源广泛，生产纯碳的过程往往比生产纯氢的过程有效能保持率高。
Further, solid carbon can be obtained from a variety of natural resources with large enough reserves and with a high exergy retaining ratio.
如果火星上的甲烷是生命现象产生的，那么释放出的甲烷和水应该明显表现出氢和碳的同位素比。
Methane and water released on Mars should show distinctive ratios for isotopes of hydrogen and carbon if life was responsible for methane production.
如果火星上的甲烷是生命现象产生的，那么释放出的甲烷和水应该明显表现出氢和碳的同位素比。
Methane and water released on Mars should show distinctive ratios for isotopes of hydrogen and carbon if life was responsible for methane production.
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