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Climatic Change is a journal dedicated to the problem of climatic variability and change in its entirety — its descriptions, causes, implications and interactions. For this reason it welcomes contributions of a multidisciplinary nature, based on extensive research projects which advance our knowledge in a variety of fields. Following Volume 43, No.1, 1999 Climatic Variability in Sixteenth-Century Europe and its Social Dimension, another special issue is published. This time it is dedicated to a related research programme that has involved historical, instrumental, astronomical, statistical and climatic studies with the aim of clarifying key problems that are of concern to the scientific community, policy makers, and citizens. We are presently witnessing a global temperature rise of 0.6 °C over the twentieth century (Jones et al., 1999). Many frequently asked questions are:

• Is this warming part …