The Coupled Carbon Cycle Climate Model Intercomparison Project (C4MIP) is designed to compare and analyze the feedbacks between the carbon cycle and climate in the presence of external climate forcing. Such feedbacks are likely to be mediated on the one hand by altered forcing of the ocean and terrestrial carbon cycles and on the other by the impact of altered CO2 concentrations in the atmosphere resulting from this forcing. The basic approach is to include models of the terrestrial and ocean carbon cycles in existing OAGCMs and run the augmented model with and without these feedbacks active.

AIMES has particularly collaborated with WGCM in the C4MIP initiative enabling a completely new step in the understanding of carbon feedbacks from global warming and advancing global climate models into Earth-system models.