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Climate uncertainty is a characteristic of the climate system. This short report examines the risks and uncertainties associated with the science, the scientists&#039; tools and methods and the policy making process and consider how they might be integrated and communicated to policy makers. As our knowledge of climate science increases, perceptions of the types and levels of uncertainty may increase or decrease. Assessment of risk and uncertainty in climate change therefore involves a large degree of subjective judgement, erring on the side of the UNFCCC principle of precaution.