1The internal combustion engine of a car relies on a mixture of air and fuel to ignite and produce motion.
2What are the environmental implications of combustion in the production of electricity from fossil fuels?
3The researchers studied the effects of combustion on the atmospheric concentration of greenhouse gases.
4The new regulations aim to reduce the negative impact of combustion emissions on public health.
5Spontaneous combustion of coal deposits has been known to occur in certain geological conditions.