We are not talking about climate, we are talking about epochs...
500 millions of years before present: it took some time to remove the CO2 from the atmosphere
400k of years before present: obvious correlation between CO2 and temperature
Years after industrial revolution: CO2 is released quickly into atmosphere again.
Holocene temperature variations: +/- 1 degC
3. Very short term
Assuming that CO2 correlates temperature (as seen last 400k years), and that CO2 will further increase, we may leave Holocene epoche quickly.