Most fuels contain carbon & hydrogen, many also contain sulfur. Fuels burn - produce waste products, which are released into atmosphere.
Combustion of hydrocarbon fuel releases energy. During combusition, both carbon & hydrogen oxidised. If combustion not complete, solid particles containing soot & unburnt fuels may be released. Due to high temperature reached when fuels burned, nitrogen in air can react with oxygen - nitrogen oxides formed. Can cause acid rain.
Carbon dioxide causes global warming due to greenhouse effect. Solid particles in air cause global dimming.
Sulfur can be removed from fuel before burning. Sulfur dioxide can be removed from waste gases after combustion - both processes add to costs.
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