Carbon dioxide only absorbs two narrow wavelengths of infrared energy. Water vapor absorbe a broad range of infrared wavelengths including the two narrow ranges absorbed by carbon dioxide. The normal distance a photon of IR energy travels before being absorbed by water vapor is less than 100 meters at mormal humidity levels so they would get absorbed with or without carbon dioxide. I think carbon dioxide has almost no effect on global temperature. The desire for crushing government regulation was desired by the left before they thought of inventing their computer model.
No smoking hot spot David Evans - THE AUSTRALIAN July 18, 20081. The greenhouse signature is missing. We have been looking and measuring for years, and cannot find it.
Each possible cause of global warming has a different pattern of where in the planet the warming occurs first and the most. The signature of an increased greenhouse effect is a hot spot about 10km up in the atmosphere over the tropics. We have been measuring the atmosphere for decades using radiosondes: weather balloons with thermometers that radio back the temperature as the balloon ascends through the atmosphere. They show no hot spot. Whatsoever.
If there is no hot spot then an increased greenhouse effect is not the cause of global warming. So we know for sure that carbon emissions are not a significant cause of the global warming. If we had found the greenhouse signature then I would be an alarmist again.
Given the above no Greenhouse gas is a cause of warming.