opinions but wants to add that the current climate warming projections could fall within well-documented natural variations in past climate and observed temperature data. These data do not necessarily support the maximum case scenarios forecast in some models." Affiliated organizations Organizations may request affiliation with AAPG if they meet a set of criteria including goals compatible with those of AAPG; membership of at least 60% professional geologists with degrees; dissemination of scientific information through publications or meetings; and membership not restricted by region. Pittsburgh Association of Petroleum Geologists Pittsburgh Geological Society Canadian Society of Petroleum Geologists Pacific Section of AAPG (PSAAPG) See also Betty Ann Elliott Fred Meissner List of geoscience organizations Society of Exploration Geophysicists Society of Petroleum Engineers Denise M. Stone References External links Official website Economic geology Geology societies Petroleum in the United States Scientific societies based in the United States Organizations based in Oklahoma Organizations established in 1907