If there was no $CO_2$ in the earth's atmosphere,the temperature of earth's surface would be

  • A
    As such
  • B
    Less than the present level
  • C
    Increase from present level
  • D
    Dependent upon oxygen amount of the environment

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Greenhouse effect is primarily due to the presence of:

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Which of the following represents the correct percentage contribution of greenhouse gases to total global warming?

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