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Northern Hemisphere (Mann et al. 1999), Arctic (Overpeck et al. 1997) and northern Eurasian (Briffa & Osborn 1999; Briffa 2000) summer surface-temperature trends over the past 1000 years (adapted from Overpeck et al. 1997; Briffa & Osborn 1999; Mann et al. 1999; Briffa 2000 available at http://www.ncdc.noaa.gov/palaeo/pubs/briffa2001/briffa2001.html).
