gcamreport: An R tool to process and standardize GCAM outputs

There is an urgent need for multi-model studies to characterize uncertainty arising from model heterogeneity.These studies aim to build a more reliable and transparent framework, informing policymakers in the design and implementation of climate policies (Guivarch et al., 2022).In response to this challenge, multiple institutes and organizations have adopted the standardized data template developed by the Integrated Assessment Modeling Consortium (IAMC).This template is maintained by the International Institute for Applied Systems Analysis (IIASA) and aims to standardize and facilitate model intercomparison exercises.For the latest Assessment Report (AR6), the Intergovernmental Panel on Climate Change (IPCC) required all contributors to homogenize their data to enable comparisons and ensure full transparency (V.Krey et al., 2014).This practice has set the foundation for a new open management of the outputs in the area of global scenario analysis.