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      Question

      Global warming is believed to be due

      to:
      A increase in oxygen in the atmosphere Correct Answer Incorrect Answer
      B increase in nitrogen in the atmosphere Correct Answer Incorrect Answer
      C increase in carbon dioxide in the atmosphere Correct Answer Incorrect Answer
      D increase in hydrogen in the atmosphere Correct Answer Incorrect Answer

      Solution

      Global warming occurs when carbon dioxide (CO2) and other air pollutants collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface. 

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