Climate change review for a scientist
EnergyNumbers suggestion is good, but you can only go so far in reading about it second hand. I suggest that you pick a grid cell of interest, then go to the World Bank's climate change knowledge portal.

Climate Change Knowledge Portal 

This gives a good cross section of 16 CMIP-5 AOGCM outputs. Check out the variation, and accuracy of the hindcasts vs evidence-based field instrumental data for the same location. Then you will get a good feel for the strengths and weaknesses of the modelling. Also, remember that water-related parameters are much less accurate to forecast than temperature-related parameters.