Carbon dioxide is NOT the primary greenhouse gas. Water vapor is, and the global warmers hate to admit it because it draws attention to the stupidity of their theories.
The computer models cannot handle water vapor (or any part of the water cycle) because it would take a lot more computing power and a lot more data input world-wide to deal with it correctly. Neither will be available any time soon.
Nothing in the atmosphere can store heat anywhere nearly as efficiently as the water molecule. People who use humidifiers with their heat in winter readily notice that the humidified air holds heat much better than dry air.
This is one of the priciples that drives weather mechanisms on this planet and yet the global warming models are unable to deal with water vapor (and clouds which are part of the water vapor cycle)
The global warmers have to tell us that water vapor and clouds have no effect but carbon dioxide does. That is exactly upside-down from reality.
What we have are some scientists who have to come up with results showing global warming or they will lose their jobs/grants and so they dutifully produce computer models which produce the results that they were designed to produce.