A model is a guess based on a theory.  Notice he tweaks the model and the results change.  interesting huh?  Models predict what we tell them to predict.  Models use a few parameters when there are over 100,000 parameters that effect our planet.  It is a complete assumption that IF the planet CONTINUES TO WARM, that is a bad thing.  That is not a fact, that is an opinion.  No study has been performed to determine if warming might actually a good thing.  Apparently every scientist on the planet is convinced that warming is bad, but it could be good.   We would use less energy on a warming planet, we could grow more food with both warmer temperatures and increased CO2 levels.  Without CO2 not only does all life on planet Earth cease to exist, it never exists.