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1- Models are only as good as the current heuristics and analytics incorporated within the modeling software, and the accuracy of the assumptions and data used to drive the model.
And that has proven to be very good indeed. Not perfect, but very good. You sound a lot like the Watchtower telling it's doe eyed followers that carbon dating is a fatally flawed technique, when in fact it is solid science that has been verified and calibrated by other techniques.
And much like that verification, computer models have shown their value looking backward by comparing their output to data collected by scientist studying ice-cores, and their accuracy as present climate models by the way they respond to inputs mimicking what we directly observe.
2- Accurately representing all forcings, including deforestation and agricultural practices is necessary. Garbage in, garbage out.
Well that's a no-shit-sherlock comment if there ever was one. Is this one more occasion where you think you've had an epiphany that people who've devoted their life to this study have not had?
For anyone genuinely interested in the history (stretching back much further than you probably imagine) of atmospheric science, and particularly modeling, here is a long but interesting primer.