There are other models of Climate Change

This is interesting. A four thousand year, peer reviewed, climate model of Greenland surface temperatures which forecasts a long term cooling trend while validating the shorter term one thousand year warming trend within the model.

Identifying Natural Contributions to Late Holocene Climate Change

www.nipccreport.org

Humlum et al.'s work is full of details and discussion on how the authors have constructed their analytical models of temperature variations, fully accounting for the large signals from millennial, multicentennial and multidecadal scales of temperature changes covering the late Holocene period.