Figure A5.4

U.S. Global Change Research Program
Matthew Dzaugis

This figure appears in chapter A5 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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