News stories each year note the increase in carbon dioxide,from combustion of coal in electrical generating plants,or from use of petroleum fuels in vehicles.Most states require emissions quality tests to limit automobile emissions.The fuels used in cars,and the carbon dioxide cars emit,were originally

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The fuels used in cars, which include petroleum and coal, are derived from ancient biological materials, primarily plants, that lived millions of years ago. These plants fixed carbon dioxide from the atmosphere through photosynthesis, and over time, under heat and pressure, these materials were transformed into oil and coal. This process did not involve dinosaurs directly (which rules out B), nor is it primarily about carbon dioxide trapped in the ocean or coral reefs (ruling out C), nor is it about carbon dioxide directly from volcanic activity (ruling out D). The Precambrian era (E) is too early for the formation of most coal and oil, which primarily formed from plant material during the Carboniferous period, about 300 million years ago.

News Stories Each Year Note the Increase in Carbon Dioxide,from