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Normative uncertainty, which arises from diverse ethical perspectives and uncertainty about distributional outcomes, poses a significant hurdle in climate policy negotiations. Such uncertainty illustrates the core challenge of achieving agreement on the moral principles or equity considerations that should guide the development of climate policies. Integrated Assessment Models (IAMs), while influential in shaping decisions, fall short in factoring in this normative uncertainty in climate policies. To address this issue, we developed an IAM framework called JUSTICE. JUSTICE leverages the economic insights of the RICE50+ model to explicitly account for spatiotemporal heterogeneity alongside probabilistic forecasting of the FaIR climate model for a better representation of climate uncertainty. We also reformulate the Social Welfare Function (SWF) in light of four distributive justice principles-Utilitarian, Sufficientarian …