Can you predict human behavior, scientific development for the next 100 years?
Do you think someone modeling climate change in 1919, included nuke technology, fracking, hybrids? Correct population growth? the efficiency increase of farming?
Heck, one Obama's favorite guys(holden 1969) predicted starvation, instead we face obesity.
http://www.aei.org/publication/18-spectacularly-wrong-predictions-made-around-the-time-of-first-earth-day-in-1970-expect-more-this-year/
We also can not predict earthquakes, tsunami's, volcano activity, or stop meteorites either. Or, impact of the robot revolution.
Yet, you place faith that we got all of that covered right now in a climate change model?
bullshyte. It's a model based on things happening now, with no new changes, which is bullshyte because the world is changing rapidly thru tech every day now.
Climate change models do one thing well. Get grant money for scientists to make more models.