I found a fine summary of some climate history of the past 5,000 years. See http://climatesci.colorado.edu/2007/02/08/ - it's written by a highly respected scientist. The archaeological and historical record for the past 5,000 years indicates the current climate warming is indistinguishable from natural cycles / trends returning climate to the condition the Earth has had numerous times in that period. For example, Viking records indicate Greenland ice was LESS circa 900 CE than now. Where are the finds of Viking SUVs if carbon dioxide & man are the only important variables? There are other examples on the link. So many contradictions to the "consensus view" exist. The "Blame Man" crowd is in the throes of a mass delusion, similar to medieval witch hysterias where witches were blamed for cold, stormy weather.
Addendum: here's another link to some fine information about this foolish anthropocentrism on the Earth's climate - http://motls.blogspot.com/2007/02/papers-challenging-geocentrism.html