It is easy to demonstrate that CO2 growth is not an adequate explanation for recent changes to the Earth’s temperature. I plotted GISS vs CO2 for three different time periods 1910-1940, 1940-1975, 1975-2009. Each time period shows hugely different results, ranging from +7 sensitivity down to -0.3 sensitivity. Even the polarity changes.
CO2 as an explanation is a major fail.
1910-1940 : 7 °C for CO2 doubling
1940-1975 : -0.3°C for CO2 doubling
1975-2009 : 3°C for CO2 doubling