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The present paper analyzes the main more indexed divergent elements among three of the integrated assessment models in the literature about climate change: the RICE (Regional Dynamic Integrated model of Climate and the Economy), the FUND (Climate Framework for Uncertainty, Negotiation and Distribution) and the PAGE (Policy Analysis of the Greenhouse Effect). The research shows how each one of them approaches core topics of the integrated assessment of the climate change (the adaptation, the impacts, the uncertainty, the extreme events and discontinuities) from different edges and points of view, arriving to a heterogeneity in the results. [ABSTRACT FROM AUTHOR]