Carbon Dioxide CO2

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Carbon Dioxide ( CO2 )

• from March 6 Lecture

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Earths Atmosphere Today

• N2 (nitrogen) 78.1
• O2 (oxygen) 20.9
• Ar (argon) 0.9
• CO2 (carbon dioxide) 0.038
• H2O (water vapor) variable

Based on number of molecules present
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The amount of CO2 can change
377 ppm in 2004
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The CO2 abundance has increased
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Temperature is trending upwards
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CO2 and the Greenhouse Effect

• The CO2 concentration in Earths atmosphere has
  fluctuated over time
• Temperature changes correlate with CO2
  concentration
• The amount of CO2 in our atmosphere today is
  higher than at any time in the past 400,000 years
• Methane (CH4) and water vapor are also greenhouse
  gases

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The CO2 Cycle on Earth
CO2 dissolves in rain
CO2 gas emitted from volcanoes
silicate rocks weathered
Carbonate rocks form