Carbon monoxide gas is created by fuel burning devices because not all of the fuel is burned.

VOA: special.2010.02.02

All right, so I'm burning some energy, I'm burning some fuel to do this somehow, to get that work to happen.

而这个路径需要先加热再冷却，这样，我需要能量来源，比如燃料，来完成做功。

麻省理工公开课 - 热力学与动力学课程节选

Fuel-burning devices can create carbon monoxide gas because not all of the fuel is burned.

VOA: special.2011.01.25

The time that we spend in congested conditions significantly adds to the amount of fuel cars and trucks are burning.

VOA: standard.2010.07.26

Many so-called greenhouse gases, such as carbon dioxide, come from burning fossil fuel such as oil or coal.

VOA: standard.2009.12.16

The bioreactors will grow algae that can produce ethanol fuel through a special process that involves using carbon dioxide from nearby coal-burning power plants to promote faster growth of the algae.

VOA: standard.2009.09.02