Praxis 5511 Practice Question
Of the following, which is believed to be the largest source of the increased concentration of carbon dioxide in Earth’s atmosphere during the last hundred years?
Correct Answer: B
Rationale: The combustion of coal and other fossil fuels has significantly contributed to the rise in atmospheric carbon dioxide over the past century due to the large quantities of carbon released during burning.
Increased volcanic activity (A) does release carbon dioxide, but its contribution is minimal compared to human activities. Decreased photosynthetic activity of plants (C) can affect carbon levels, but it is not the primary driver of the recent increase. Lastly, increased human respiration (D) does contribute carbon dioxide, but the scale is negligible compared to emissions from fossil fuel combustion. Thus, human activities, particularly fossil fuel use, are the main contributors to rising CO2 levels.
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