|Atmospheric CO2 from 3 ice-core studies shown on vertical axis, thousands of years ago shown on horizontal axis. Linear extrapolation from the peak of the last ice age ~18,000 years ago shows that the rate of rise in CO2 has not changed over the past 18,000 years. Notations in red added. Graph source.
Sunday, June 26, 2011
CO2 levels have risen at the same rate for past 18,000 years
While climate alarmists claim CO2 levels have risen at an unprecedented rate since the industrial revolution, extrapolation from ice core data shows the rate of rise has been steady since the peak of the last ice age about 18,000 years ago. This shows that man-made CO2 (~3% of total emissions) has had little effect on atmospheric levels of CO2, which instead are driven by outgassing from the oceans during interglacial periods; interglacial periods are driven by solar insolation, not CO2.
Posted by MS at 11:02 AM