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On past temperatures and anomalous late-20th-century warmth

  1. Michael Mann1
  2. Caspar Amman2
  3. Ray Bradley3
  4. Keith Briffa4
  5. Philip Jones4
  6. Tim Osborn4
  7. Tom Crowley5
  8. Malcolm Hughes6
  9. Michael Oppenheimer7
  10. Jonathan Overpeck8
  11. Scott Rutherford9
  12. Kevin Trenberth10
  13. Tom Wigley11

Article first published online: 19 DEC 2012

DOI: 10.1029/2003EO270003

Issue

Eos, Transactions American Geophysical Union

Eos, Transactions American Geophysical Union

Volume 84, Issue 27, page 256, 8 July 2003

Additional Information

How to Cite

Mann, M., et al. (2003), On past temperatures and anomalous late-20th-century warmth, Eos Trans. AGU, 84(27), 256–256, doi:10.1029/2003EO270003.

Author Information

  1. 1

    University of Virginia, Charlottesville

  2. 2

    National Center for Atmospheric Research, Boulder, Colo.

  3. 3

    University of Massachusetts, Amherst

  4. 4

    Climatic Research Unit, University of East Anglia, Norwich

  5. 5

    Nicholas School of the Environment and Earth Science, Duke University, Durham, N.C.

  6. 6

    Laboratory of Tree-Ring Research, University of Arizona, Tucson

  7. 7

    Princeton University, N.J.

  8. 8

    Dept. of Geosciences and Institute for the Study of Planet Earth, University of Arizona, Tucson

  9. 9

    University of Rhode Island, Narragansett

  10. 10

    National Center for Atmospheric Research, Boulder, Colo.

  11. 11

    University Corporation for Atmospheric Research and NCAR, Boulder, Colo.

Publication History

  1. Issue published online: 19 DEC 2012
  2. Article first published online: 19 DEC 2012

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Evidence from paleoclimatic sources and modeling studies support AGU's official position statement on climate change and greenhouse gases; namely that there is a compelling basis for concern over future climate changes, including increases in global-mean surface temperatures, due to increased concentrations of greenhouse gases, primarily from fossil fuel burning.

More specifically a number of reconstructions of large-scale temperature changes over the past millennium support the conclusion that late-20th century warmth was unprecedented over at least the past millennium. Modeling and statistical studies indicate that such anomalous warmth cannot be fully explained by natural factors, but instead, require a significant anthropogenic forcing of climate that emerged during the 19th and 20th centuries.

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