You may recall my earlier post:
Well, it turns out that Roy Spencer has written something worth reading about the subject:
Spencer has created a simple model to illustrate the point,and the mechanism he suggests is changes in cloud cover. He notes that this model can explain most of the warming and the features of the temperture record without any help from CO2 or aerosols being invoked.
While at this point it is speculative, Spencer has managed to show how his ideas could work, and obviously if you want to attribute climate change in the future you won’t be allowed to handwave around this issue.