| Caption: |
Measurement of the carbon dioxide content in air bubbles and isotopic ratios in glacial ice from cores taken at Vostok, Antarctica, show that atmospheric CO2 levels have corresponded closely to air temperature for over 410,000 years. Records from other ice cores show a similar pattern extending back over 800,000 years. (Modified from Petit, J. R., Jouzel, J., et. al. 1999. Climate and atmospheric history of the past 420,000 years from the Vostok ice core in Antarctica. Nature 399: 429-36) |
| Keywords: |
atmosphere, climates, climatology, global warming, greenhouse effect, gases, carbon dioxide, temperatures |
