The current models assume a stay state prior to man and his carbon based fuels. This assumption that current global temperature are going up “only” because of CO2 are false. Going back almost 3000 years there is a clear cycle of war and cold period of around 1,000 year and since the last cold period ended between 1600 and 1650 we are in a long cycle of increasing temperatures for at least another 100 years. The current pause is caused by a shorter cycle related to El Nino La Nina and the Atlantic Multidecadal Oscillation (AMO) which is in a 30 year cold cycle right now. When that ends temperatures will go back up.
Summary: Climate models are important for several reasons. Large flows of tax dollars go to their construction and operation. Their predictions dominate the public policy debate about climate change (to the exclusion of other tools, such as predictability studies). In this post eminent climate scientist Roger Pielke Sr. explains that long-term model forecasts have shown little skill at forecasting. Post your questions in the comments; he’ll answer as time permits. {1st of 2 posts today).
“I offer a toast to the future, the undiscovered country.”
— Klingon Chancellor Gorkon in Star Trek IV.
The undiscovered country from whose bourn no traveler returns, puzzles the will and makes us rather bear those ills we have than fly to others that we know not of? …And thus the native hue of resolution is sicklied o’er with the pale cast of thought, and enterprises of great pith and moment with this…
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Centinel2012 
“Do models accurately predict climate change?”
Clearly not.
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