Initial Note: The temperature is measured at present at 0.5 degrees above baseline. The temperature increase from baseline may be caused by many factors, including CO2. Experimental data is needed to verify the models.
We can thank Dr. Hansen for his work disproving the effects of CO2 on global temperature. His work appears to disprove the catastrophic anthropogenic global warming theory. I understand, that as he has made millions of dollars promoting global warming, he probably doesn’t see this result as publishable.
Figure 1. Hansen’s models of global warming following a steady increase in our production of CO2 (1.5%), a continued production of CO2 at the current (year 1989) rate, and an abrupt halt of producing CO2.
On Figure 1, you can see that Dr. Hansen predicts a large increase in temperature driven directly by the increase of CO2 in the atmosphere. Temperatures by 2015 are 1.5 degrees above baseline. While the US and Europe have reduced production of CO2 significantly, world production of CO2 remains significantly above year 2000 levels, leading to the top line prediction being the predicted outcome.
Figure 2. A combination of Figure 1 and current temperature data.
On Figure 2, you can see the current temperature data plotted along with the predictions made in Hansen’s model. It is clear from observation that, with the exception of 1998, the data falls along the lowest line of prediction. 1998 has been explained as a specific Pacific Ocean event, resulting in the hottest year on record.
Conclusions: The model which contained no CO2 forcing more correctly predicted the future than either model which contained CO2 forcing. CO2 forcing does not appear to correctly predict future temperatures.
Further Study: CO2 is known to absorb specific bands of IR light at 2349 cm−1 and at 667 cm−1. Addition of CO2 does increase absorption of heat in the atmosphere at those two wavelengths, however, those wavelengths may be sufficiently filled such that no further addition of CO2 causes added absorption. However, that is just a theory and needs further modeling and experimental data to prove. Alternatively, the current heating may have nothing to do with CO2. The CO2 heating may become significant at some future partial pressure. Again, modeling and testing is needed to quantify this assertion.