1. A predictive emissions modeling method comprising: (a) utilizing an emissions predication model that determines an emission level of a material transformation process based upon an input value or a modeled input value in place of the input value, evaluating an effect of replacement of the input value by the modeled input value on an estimate of the emission level; (b) determining whether the input value is in need of replacement; and (c) if the input value is in need of replacement and the effect of replacement of the input value by the modeled input value is acceptable, computing the emission level via the emissions prediction model based upon the modeled input value.