Climate over the past two millennia

Michael E. Mann

Research output: Chapter in Book/Report/Conference proceedingChapter

94 Scopus citations


To assess the significance of modern climate change, it is essential to place recent observed changes in a longer-term context. This review assesses the evidence from both "proxy" climate data and theoretical climate model simulations with regard to the nature and causes of climate variability over a time interval spanning roughly the past two millennia. Evidence is reviewed for changes in temperature, drought, and atmospheric circulation over this timescale. Methods for reconstructing past climate from proxy data are reviewed and comparisons with the results of climate modeling studies are provided. The assessment provided affirms the role of natural (solar and volcanic) radiative forcing in past changes in large-scale mean temperature changes and in dynamical modes of climate variability such as the North Atlantic Oscillation (NAO) and El Niño/Southern Oscillation (ENSO) influencing large-scale climate. At hemispheric scales, late twentieth century warmth appears unprecedented in the context of at least the past 2000 years. This anomalous warmth can only be explained by modern anthropogenic forcing.

Original languageEnglish (US)
Title of host publicationAnnual Review of Earth and Planetary Sciences
EditorsRaymond Jeanloz, Arden Albee, Kevin Burke, Katherine Freeman
Number of pages26
StatePublished - 2007

Publication series

NameAnnual Review of Earth and Planetary Sciences
ISSN (Print)0084-6597

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science


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