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“ ...this study provides evidence for intervals of signiﬁcant warmth in the [Northern Hemisphere] within the so-called Medieval Warm Period and for signiﬁcantly colder intervals during the so-called ” Li le Ice Age period. — Osborne and Briﬀa, 2006
the ‘divergence problem’ is deﬁned as the tendency for tree growth at some previously temperature-limited northern sites to demonstrate a weakening in mean temperature response in recent decades.Source: D’Arrigo et al., 2008