Estaría bien reproducir las conclusiones completas de Mann 2008 antes de lanzar las campanas al vuelo:
We find that the hemispheric-scale warmth of the past decade for the NH is likely anomalous in the context of not just the past 1,000 years, as suggested in previous work, but longer. This conclusion appears to hold for at least the past 1,300 years (consistent with the recent assessment by ref. 2) from reconstructions that do not use tree-ring proxies, and are therefore not subject to the associated additional caveats. This conclusion can be extended back to at least the past 1,700 years if tree-ring data are used, but with the additional strong caveats noted. When differences in scaling between previous studies are accounted for, the various current and previous estimates of NH mean surface temperature are largely consistent within uncertainties, despite the differences in methodology and mix of proxy data back to approximately A.D. 1000. The reconstructions appear increasingly more sensitive to method and data quality and quantity before A.D. 1600 and, particularly, before approximately A.D. 1000. Conclusions are less definitive for the SH and globe, which we attribute to larger uncertainties arising from the sparser available proxy data in the SH. Given the uncertainties, the SH and global reconstructions are compatible with the possibility of warmth similar to the most recent decade during brief intervals of the past 1,500 years. A targeted effort to recover additional high-quality, long paleoclimate proxy records from the SH could reduce these current existing uncertainties. Similarly, reducing uncertainties for the period before A.D. 1000 for the NH will require additional proxy records of sufficient length that preserve climate signal on the millennial time scale.
Para personas perspicaces "brief intervals" no son un siglo o dos (como el actual calentamiento global) y "less definitive" significa que se han de coger más con pinzas que las del hemisferio norte y de ahí sacar conclusiones (como que hubo un calentamiento en el hemisferio sur comparable al actual) es bastante arriesgado.