CO2 and Temperature Changes Are Correlated for 800,000 Years
Summary . 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 (CO ...