Scientists Have Correlated Average Global Temperature with Atmospheric Carbon Dioxide

question 32

Multiple Choice

Scientists have correlated average global temperature with atmospheric carbon dioxide levels for the last 160,000 years using ice cores from Antarctica.How is the carbon dioxide level determined?

• A)by measuring the CO₂ concentration in trapped gases in the ice layers
• B)by measuring the ¹⁸O/¹⁶O ratio in the CO₂ molecules
• C)by extrapolating the CO₂ level from the temperature of the ice
• D)by extrapolating the CO₂ level from the average global temperature

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