The atmospheric CO2 concentration increased by around 20 ppm during 2002 — 2011. (metlink.org)
These models can tell us that if the CO2 concentration increases by a certain amount, the temperature will increase by a certain amount. (theintercept.com)
However, the ratio at which CO2 concentration increases in the atmosphere slowed down between the 80's and the 90's, from 1.6 ppm / year to 1.5 ppm / year. (realclimate.org)