CO2 and Temperature Changes Are Correlated for 800,000 Years

Jun 29th, 2013 | By | Category: Featured Story

Global warming and cooling cycles over geological time scales are correlated with increasing and decreasing concentrations of atmospheric carbon dioxide, respectively. This post documents correlated changes occurring a) during the recent post-industrial period of global warming, b) over the last one thousand years, and c) over the past 800,000 years.

Except for the industrial period, these changes reflect only global physical processes not involving actions by mankind, showing that the greenhouse effect is an established physical phenomenon. Each geological warming or cooling trend, coupled with its change in carbon dioxide concentration, occurs very slowly, lasting thousands of years. The current man-made warming trend, in contrast, is occurring at least 60 times faster, and its pace is accelerating.

Introduction. The previous post discussed variations over time in the atmospheric concentration of carbon dioxide (CO2), the major greenhouse gas. Recent changes in CO2 concentration measured directly since 1958 were contrasted with a slightly broader record, extending back to 1700 CE, and finally with the geologic record of atmospheric CO2 cataloging concentrations as far back as 800,000 years before the present.

For more on this story, visit: Global Warming Blog by Henry Auer: CO2 and Temperature Changes Are Correlated for 800,000 Years.

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