These pages document the IIASA Integrated Assessment Modeling (IAM) framework, also referred to as MESSAGEix-GLOBIOM, owing to the fact that the energy model MESSAGEix and the land use model GLOBIOM are its most important components. MESSAGEix-GLOBIOM was developed for the quantification of the so-called Shared Socio-economic Pathways (SSPs) which are the first application of the IAM framework.

This documentation is under constant development and is being expanded with additional information to reflect the latest changes in the modeling framework.

When referring to MESSAGEix-GLOBIOM as described in this document, please use the following citations: 1

  • V. Krey, P. Havlik, P. N. Kishimoto, O. Fricko, J. Zilliacus, M. Gidden, M. Strubegger, G. Kartasasmita, T. Ermolieva, N. Forsell, M. Gusti, N. Johnson, J. Kikstra, G. Kindermann, P. Kolp, F. Lovat, D. L. McCollum, J. Min, S. Pachauri, Parkinson S. C., S. Rao, J. Rogelj, H. and Ünlü, G. Valin, P. Wagner, B. Zakeri, M. Obersteiner, and K. Riahi. MESSAGEix-GLOBIOM Documentation – 2020 release. Technical Report, International Institute for Applied Systems Analysis (IIASA), Laxenburg, Austria, 2020. URL:, doi:10.22022/iacc/03-2021.17115.

  • O. Fricko, P. Havlik, J. Rogelj, Z. Klimont, M. Gusti, N. Johnson, P. Kolp, M. Strubegger, H. Valin, M. Amann, T. Ermolieva, N. Forsell, M. Herrero, C. Heyes, G. Kindermann, V. Krey, D. L. McCollum, M. Obersteiner, S. Pachauri, S. Rao, E. Schmid, W. Schoepp, and K. Riahi. The marker quantification of the Shared Socioeconomic Pathway 2: A middle-of-the-road scenario for the 21st century. Global Environmental Change, 42:251–267, 2017. doi:10.1016/j.gloenvcha.2016.06.004.


Download these citations in RIS or BibTeX format (web only).

The MESSAGEix-GLOBIOM Integrated Assessment Model is based on the MESSAGEix framework, an open-source energy systems optimization modelling environment including macro-economic feedback using a stylized computable general equilibrium model. When referring to the software underpinning MESSAGEix-GLOBIOM rather than the data or specific assessments, please see the “User guidelines and notice” section of the documentation, which indicates to use at least the following citation:

  • Daniel Huppmann, Matthew Gidden, Oliver Fricko, Peter Kolp, Clara Orthofer, Michael Pimmer, Nikolay Kushin, Adriano Vinca, Alessio Mastrucci, Keywan Riahi, and Volker Krey. The MESSAGEix Integrated Assessment Model and the ix modeling platform (ixmp): An open framework for integrated and cross-cutting analysis of energy, climate, the environment, and sustainable development. Environmental Modelling & Software, 112:143–156, 2019. doi:10.1016/j.envsoft.2018.11.012.

We thank Edward Byers, Jessica Jewell, Ruslana Palatnik, Narasimha D. Rao, and Fabio Sferra for their valuable comments that helped improving this manuscript.