I don't see a problem. Is there something in the body that should be alarming?
"We further conclude that the incautious use of GCMs to make future climate projections from incomplete or unknown forcing scenarios is antithetical to the intrinsically heuristic value of models. Such uncritical application of climate models has led to the commonly held but erroneous impression that modeling has proven or substantiated the hypothesis that CO2 added to the air has caused or will cause significant global warming."
I would suggest you read the guts of the paper to learn why the state of the current "state of the art" GCMs are simply inadequate to the task of saying anything as regards climate or making political and economic decisions effecting the world or US for that matter.