This paper addresses the energy and environmental implications of sequestrating CO 2 from a coal power plant using magnesium silicate rock. An accounting type life cycle assessment (LCA) of the mineralization method under development at Åbo Akademi University (ÅAU), Finland, is presented and the results are compared with the process developed at the National Energy Technology Laboratory (NETL), formerly Albany Research Council (ARC) in the US. The ÅAU process is a multi-staged route where CO 2 is sequestered via a process that first produces magnesium hydroxide, Mg(OH) 2 from Mg silicate. The Mg(OH) 2 produced is later reacted with CO 2 in a high temperature gas/solid pressurized fluidized bed (FB) reactor, forming pure, stable and environmentally benign MgCO 3 product. This study addresses the following important issues; (a) the material and energy requirements of sequestering 1ton of CO 2 (t-CO 2 ) in mineral silicate, (b) the overall environmental burdens associated with CO 2 sequestration using serpentinite mineral, (c) the priorities and opportunities for reduction of energy requirements and environmental impacts associated with mineralizing CO 2 , and (d) comparison of LCA results of the ÅAU mineralization process route with that of the mineralization process developed by NETL. Exergy calculations show that with heat recovery mineralizing 1t-CO 2 using the ÅAU process requires 3.6GJ/t-CO 2 while that of the NETL needs 3.4GJ/t-CO 2 . Applying results of exergy analysis in the life cycle inventory (LCI) models of the ÅAU and the NETL processes leads to 517kg CO 2 e and 683kg CO 2 e of greenhouse gas emissions (in CO 2 equivalents) respectively, for every ton of CO 2 mineralized in serpentinite.