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AAPG Bulletin, V. 84, No. 4 (April 2000), P. 466-471.
Ad Hoc Committee on Global Climate Issues: Annual Report1Lee C. Gerhard2 and Bernold M. "Bruno"
Hanson,3 Co-chairs ©Copyright 2000. The American Association of Petroleum Geologists. All rights
1Manuscript received October 18, 1999; revised manuscript received October 29,
1999; final acceptance October 29, 1999.
2Kansas Geological Survey, 1930 Constant Avenue, Lawrence, Kansas 66047-3724;
e-mail: [email protected]
3Independent, P.O. Drawer 1269, Midland, Texas 79702-1269.
Committee members who have contributed to this report: Lee C. Gerhard, co-chair; Bernold
M. Hanson, co-chair; committee members: Roy D. Adams, John P. Bluemle, William L. Fisher,
David Jenkins, Michael S. Johnson, Alfred H. Pekarek, E. A. Shinn, Douglas B. Swift, Don
The AAPG Ad Hoc Committee on Global Climate Issues has studied the supposition of
human-induced climate change since the committee's inception in January 1998. This paper
details the progress and findings of the committee through June 1999. At that time there
had been essentially no geologic input into the global climate change debate. The
following statements reflect the current state of climate knowledge from the geologic
perspective as interpreted by the majority of the committee membership. The committee
recognizes that new data could change its conclusions. The earth's climate is constantly
changing owing to natural variability in earth processes. Natural climate variability over
recent geological time is greater than reasonable estimates of potential human-induced
greenhouse gas changes. Because no tool is available to test the supposition of
human-induced climate change and the range of natural variability is so great, there is no
discernible human influence on global climate at this time.
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