Lisa Rennels, Cora Kingdon, Richard J. Plevin, James Rising, and David Anthoff About the Authors Lisa Rennelsis a postdoctoral fellow through the Stanford Energy PostdoctoralFellowship in the Environmental Social Sciences department in the Doerr School ofSustainability at Stanford University. Dr. Rennels received her PhD from the Energy and Cora Kingdonis a PhD candidate in the Energy and Resources Group at UC Berkeley.Prior to this role, Kingdon worked on integrated assessment modeling as part ofthe Social Cost of Carbon Initiative at Resources for the Future. She holds a BS in Richard J. Plevinis an independent researcher and consultant. Dr. Plevin retired fromUC Berkeley, where he recieved his PhD at their Energy and Resources Group. James Risingis an associate professor at the University of Delaware’s School ofMarine Science and Policy. Dr. Rising recieved his PhD in sustainable development at David Anthoffis an associate professor in the Energy and Resources Group at theUniversity of California, Berkeley, a senior fellow at the Berkeley Institute for DataScience, and a university fellow at Resources for the Future. He also was a visitingresearch fellow at the Smith School of Enterprise and the Environment, University Software Availability Name of package: Mimi.jl (version 1.5.3). Year first available: 2015. Developers: David Anthoff, Cora Kingdon, Richard Plevin, Lisa Rennels, and JamesRising. Email:lrennels@stanford.edu. Package availability: The Mimi package is free and downloadable fromhttps://www.mimiframework.org. Reference material is available in the package documentation. License: MIT. Software requirement: Julia (≥1.10.0), a free software language, available athttps://julialang.org. CRediT Authorship Contribution Statement Lisa Rennels: Writing—review and editing, Writing—original draft, Visualization,Software, Formal analysis, Data curation, Methodology, Conceptualization. Cora Kingdon: Writing—review and editing, Visualization, Software, Data curation.Richard Plevin: Writing—review and editing, Visualization, Software, Data curation.James Rising: Writing— review and editing, Visualization, Software, Data curation.David Anthoff: Writing—review and editing, Visualization, Software, Data curation,Supervision, Methodology, Conceptualization, Project administration, Funding and Acknowledgements We thank Kevin Rennert, Bryan Parthum, and David Smith for helpful feedback onMimi’s development. We also thank Solomon Hsiang and Bob Kopp, who were involvedin some form in devising the package name during a dinner with David Anthoff in 2015.(Details are lost in the fog of history). The findings and conclusions in this report arethose of the authors and do not necessarily reflect those of Resources for the Future, Development of the Mimi platform was supported by the Alfred P. Sloan Foundation,the Hewlett Foundation, individual donations to RFF’s Social Cost of Carbon Initiative,and by the National Science Foundation through the Network for Sustainable ClimateRisk Management (SCRiM) under NSF cooperative agreement GEO-1240507. During The authors declare that they have no known competing financial interests or personalrelationships that could have appeared to influence the work reported in this paper. About RFF Resources for the Future (RFF) is an independent, nonprofit research institution inWashington, DC. Its mission is to improve environmental, energy, and natural resourcedecisions through impartial economic research and policy engagement. RFF iscommitted to being the most widely trusted source of research insights and policy Working papers are research materials circulated by their authors for purposes ofinformation and discussion. They have not necessarily undergone formal peer review.The views expressed here are those of the individual authors and may differ from those Sharing Our Work Our work is available for sharing and adaptation under an Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) license. Youcan copy and redistribute our material in any medium or format; you must giveappropriate credit, provide a link to the license, and indicate if changes were made,and you may not apply additional restrictions. You may do so in any reasonablemanner, but not in any way that suggests the licensor endorses you or your use.You may not use the material for commercial purposes. If you remix, transform, or Abstract Integrated assessment models that couple representations of human and naturalsystems play a central role in climate economics research and climate policy analysis,but their interdisciplinary scope and increasing complexity demand more advancedcomputational platforms. The fragmented ecosystem of tools and programminglanguages used for these models slows research, impedes transparent policy analysis,complicates cross-institutional collaboration, and creates barriers for newcomers toprogramming. This paper presents Mimi, an open source software plat