In scientific literature, estimates of the sensitivity of the climate to changes in CO2 concentration are shrinking and headed toward zero. “The trajectory for the published estimates of transient climate response (TCR, the average temperature response centered around the time of CO2 doubling) and equilibrium climate sensitivity (ECS, the temperature response upon reaching an equilibrium state after doubling) are shown to be declining from an average of about 3°C earlier in the century to below 2°C and edging towards 1°C for the more recent years.”
“This visual evidence would appear to indicate that past climate model determinations of very high climate sensitivity (4°C, 5°C, 6°C and up) have increasingly been determined to be in error. The anthropogenic influence on the Earth’s surface temperature has likely been significantly exaggerated.”
budbromley 
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