The ice is very stable in Antarctica. Ice cores have been extracted at a place named Vostok which reveal temperatures and CO2 levels from the past. What is interesting here is that CO2 follows temperature and not visa versa. In the past 450,000 odd years, there is no exception (not including the last 100 years) that temperatures changed first and then CO2 levels followed that change. As temperatures warmed CO2 levels increased and as they cooled temperatures decreased. link link

This is not to say increasing CO2 in the 20th and 21st Century is not in part caused by man but we must also recognize the natural relationship between CO2 and temperature can also be from natural forces.  

1) there had been no statistically significant atmospheric warming despite a continued increase in atmospheric CO2 levels; 2) changes in global temperatures in recent decades were far from unusual; 3) new balloon and satellite data showed that the atmosphere was far less sensitive to CO2 forcing than the climate models had predicted; and 4) there was mounting evidence that EPA’s greenhouse gas rules would have no discernible climate impact