Is there any evidence that past changes in greenhouse gas concentrations have been linked to climate change?
Response: Yes. For example, the relationship between greenhouse gases and climate change is strongly supported by the analyses of ice samples taken from deep within ice sheets in Antarctica and Greenland. These samples provide excellent archives of fossilized air bubbles trapped within the ice, and thereby provide a record of the variations in concentrations of atmospheric greenhouse gases over hundreds of thousands of years. The relative concentrations of different oxygen and hydrogen isotopes in the ice itself can also indicate how regional air temperatures have changed over time. These analyses indicate that the atmospheric concentrations of CO2, CH4 and N2O have remarkably strong correlations with the air temperature over Antarctica and Greenland. Explanation: Studies of polar ice cores have demonstrated that atmospheric greenhouse gas concentrations are linked to changes in past climate. The latest scientific analyses of ice core samples from Antarctica, for example, provide recor
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- Is there any evidence that past changes in greenhouse gas concentrations have been linked to climate change?
