CO2 CAN ONLY CAUSE 0.02 DEG. C PER YEAR SAYS PROF ROY SPENCER

 in a warming world due to increasing CO2 there will be a statistical increase in “unusually warm” years. But assuming the warming is entirely due to steadily increasing CO2 causing a slight (currently ~1%) energy imbalance in the climate system, then the warming that results is about ~0.02 deg. C per year.

Anything different from that small 0.02 deg. C per year warming is due to natural climate variability. 

An unusually warm year or two cannot be blamed on climate change « Roy Spencer, PhD (drroyspencer.com)