Word: byproduct
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Dates: during 1970-1970
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Among modern technology's more unwelcome gifts is a man-made surplus of carbon monoxide, a toxic gas that cannot be seen or smelled. One way CO is formed is by burning any substance that contains carbon-fuel oil, for example, or tobacco. As a byproduct of the incomplete combustion of gasoline, CO is a prime ingredient of auto exhaust, which is the main source of air pollution in big cities...