Pacific Climate Impacts Consortium (PCIC)2025-03-172025-03-172024-07https://hdl.handle.net/1828/21646This Science Brief covers a recent paper in the Journal of Advances in Modeling Earth Systems that examines to what extent shared components and computer code between models affects their simulated climate sensitivities, feedbacks and resulting projections of surface air temperature. It finds that models with shared code tend to have greater similarity in their climate sensitivities, strengths of feedbacks, and therefore in their projected surface temperatures. The authors also demonstrated that weighting ensembles of models according to their family resemblance resulted in a lower equilibrium climate sensitivity than when using a simple ensemble mean, and also reduced differences in climate sensitivity between the two most recent generations of climate models. \enUN SDG 13: Climate Action#science briefPacific Climate Impacts Consortium (PCIC)Other