1. A method for evaluating a carbon dioxide (CO 2 ) sequestration site, comprising: a) obtaining data relating to the site; b) generating primary input parameter values; c) calculating reservoir model input parameters utilizing a pore-level physics model from a realization of the primary input parameter values; d) constructing a reservoir simulation model using the reservoir model input parameters; e) generating output values using the reservoir simulation model; f) converting the output values into values of a performance metric; g) repeating the calculating, constructing, generating, and converting until statistical convergence of a probability distribution of the performance metric; h) determining whether uncertainty represented by an answer product generated from the performance metric probability distribution prohibits a definitive determination regarding the site based on predetermined criteria; and i) if said uncertainty of said performance metric values prohibit said definitive determination, performing a global sensitivity analysis for the performance metric in order to identify measurements associated with said site which will provide additional data which can reduce said uncertainty of the performance metric values.