Figure : co2_10k

800,000 Years of CO2 and Temperature Change

Figure -.4

U.S. Global Change Research Program
Matthew Dzaugis

This figure appears in chapter appendix-5-frequently-asked-questions of the Impacts, Risks, and Adaptation in the United States: The Fourth National Climate Assessment, Volume II report.

This chart shows atmospheric CO2 concentrations (left axis, blue line) and changes in temperature (compared to the average over the last 1,000 years; right axis, red line) over the past 800,000 years, as recorded in ice cores from Antarctica. Also shown are modern instrumental measurements of CO2 concentrations through 2017. Current CO2 concentrations are much higher than any levels observed over the past 800,000 years. Source: adapted from EPA 2017.a6cf3fb6-47bc-4b73-a355-65bc0b17c0c3

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This figure was created on June 13, 2017.

This figure was submitted on December 03, 2018.


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