Records of past climate change, particularly those reflecting the pre-industrial era, must be actively sought out and refined as a source of valuable new data on the natural component of climate variability.
Climate data must be made freely available to researchers worldwide; data from many sources contribute to the solution of research problems.
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EXECUTIVE SUMMARY ."
Natural Climate Variability on Decade-to-Century Time Scales . Washington, DC: The National Academies Press,
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