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              <p>Integrated assessment models are critical tools for scientists to understand the complex interactions between human and natural systems, and for policymakers to design effective policies to tackle global societal and environmental challenges. However, the lack of transparency and reproducibility of the models hinders their use and trust in their results. In this paper, we present a new open-source implementation of the recent Earth4All integrated assessment model in the Julia programming language, which has been developed according to best coding practices using a modular modeling framework (WorldDynamics.jl), and is publicly available in a GitHub repository for community inspection and use under an open source license. We describe the model structure, data and parameters, and present a set of experiments to validate the new implementation and to show its capabilities. By providing an open-source, modular, well-documented implementation of the Earth4All model on a widely-used software development platform, we hope to foster the use of the model by the scientific community and facilitate the development of new integrated assessment models.</p>
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