CO2 levels have risen at the same rate for past 18,000 years

The Hockey Schtick
"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."