Read here. If human CO2 was causing present global warming, as dictated by the IPCC climate models, current global temperatures would be 1.3°C higher than actually observed. Where does that leave the various climate models that are predicting anywhere from 2.4°C to 7.0°C+ by year 2100?
The Brookhaven scientists don't have a scientific clue as to the future, but they are more than willing to speculate about why temperatures have not matched model predictions:
“Because of present uncertainties in climate sensitivity and the enhanced reflectivity of haze particles,” said Schwartz, “it is impossible to accurately assign weights to the relative contributions of these two factors. This has major implications for understanding of Earth’s climate and how the world will meet its future energy needs.”
No mention of other climate forcings that climate models basically ignore or minimize, which may better explain global cooling/warming directions than the faddish CO2 myopia affecting the majority of climate scientists.