Most of the carbon monoxide found in the atmosphere does not come from natural sources.

Name: Most of the carbon monoxide found in the atmosphere does not come from natural sources.
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Most of the carbon monoxide in the atmosphere comes from human activities such as burning of fossil fuels and biomass burning. Natural sources such as wildfires and volcanic eruptions also contribute to some extent, but to a much lesser degree.

Most of the Carbon Monoxide Found in the Atmosphere Does