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response modes? What controls the degree and nature of the
spatial distributions and interactions of the modes, and how do
It is clear that a more comprehensive understanding of the
variability of these patterns on decade-to-century time scales is
absolutely essential if we are truly to distinguish between
anthropogenic change and natural climate variability, or understand
their interaction. If an enhanced greenhouse effect strengthens or
phase locks existing natural modes of variability, the study of
dec-cen variability and the study of anthropogenic change are
inextricably combined. It will be impossible to understand one
without the other.