Questions

1. During what season is the monthly mean CO₂ concentration greatest in Pt. Barrow, Alaska?
   
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2. If you were in the Southern Hemisphere, during what season would the monthly mean CO₂ concentration be greatest at the Amundsen - Scott South Pole Station, Antarctica?
   
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3. Why do CO₂ concentrations vary less at the South Pole location than at Pt. Barrow?
   
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4. Why do scientists collect CO₂ data at remote isolated locations, such as Alaska and Antarctica?
   
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