In this paper published in June 2018 lead by Stéphanie Duchamp-Alphonse, we show that a higher carbonate production and burial by coccolithophores in the Southern Ocean has contributed to an elevation of the Atmospheric pCO₂ during the last deglaciation (18,600-11,500 year BP). A weakening of Biological Carbon Pump during the phases of carbon outgassing of the last deglaciation, is due in part to an increased of the Counter Carbon Pump along with higher surface ocean fertility and elevated [CO2aq]. This is another indication that coccolithophores are important players in carbon cycle, and that in fact they can participate to an increase of the atmospheric pCO₂ through the carbonate counter pump (although this is counter intuitive for many of us).