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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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joewalcott24 joewalcott24
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6 years ago
The current level of atmospheric ________ recently surpassed 400 parts per million.
 
  A) carbon dioxide
  B) chlorofluorocarbons
  C) methane
  D) nitrous oxide
  E) water vapor
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zxcvbnzxcvbn
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