Subject: Is terrestial heat flux incorporated in paleoclimate models?

Heat flux from the earth has decreased with time as the earth cools.  
Paleoclimatologists use fossil and other evidence to infer global climate in 
early eras of earth history.  The results are often interpreted in light of 
"global warming" and "the greenhouse effect".  Do the models used incorporate 
the decreased heat flux from the surface of the earth?  Is the heat flux a 
significant source of the global heat balance?

Re: Is terrestial heat flux incorporated in paleoclimate models?