“2019 years”. climate-lab-book.ac.uk (2020年1月30日). 2020年2月2日時点のオリジナルよりアーカイブ。2020年2月2日閲覧。 ("The data show that the modern period is very different to what occurred in the past. The often quoted Medieval Warm Period and Little Ice Age are real phenomena, but small compared to the recent changes.")
doi.org
Michael E. Mann , Zhihua Zhang, Scott Rutherford, Raymond S. Bradley, Malcolm K. Hughes, Drew Shindell, Caspar Ammann, Greg Faluvegi, and Fenbiao Ni (2009). “Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly”. Science326 (5957): 1256-1260. doi:10.1126/science.1177303.
“2019 years”. climate-lab-book.ac.uk (2020年1月30日). 2020年2月2日時点のオリジナルよりアーカイブ。2020年2月2日閲覧。 ("The data show that the modern period is very different to what occurred in the past. The often quoted Medieval Warm Period and Little Ice Age are real phenomena, but small compared to the recent changes.")
