And the data from the ice cores confirms that. It is well-known that there have been warmer periods in the Earth's history. Yet, CO2 levels have never been as high as they are now.
The EPICA core extended the record of Antarctic climate back to maybe 800,000 years, and the first 650,000 years have been analysed for atmospheric greenhouses gas concentrations, saved in tiny bubbles in the ice core:
Yet, since the beginning of the Industrial Revolution, the concentration of CO2 has increased from 280 ppm to 380 ppm.
The current rise of CO2 concentration is not a consequence of climate warming. In fact, it seems to be inexplicable when relying on climate warming as the only reason, according to the data from the last, uh, 650,000 years.