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Research Article

The ecology of religious beliefs

Carlos A. Botero, Beth Gardner, Kathryn R. Kirby, Joseph Bulbulia, Michael C. Gavin, and Russell D. Gray
  1. aInitiative for Biological Complexity, Department of the Interior Southeast Climate Science Center, and
  2. cDepartment of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27695;
  3. bDepartment of Biology, Washington University in St. Louis, St. Louis, MO 63130;
  4. dDepartment of Ecology & Evolutionary Biology and Department of Geography and Program in Planning, University of Toronto, Toronto, ON, Canada M5S 3E8;
  5. eSchool of Art History, Classics and Religious Studies, Victoria University of Wellington, Wellington 6140, New Zealand;
  6. fDepartment of Human Dimensions of Natural Resources, Colorado State University, Fort Collins, CO 80523;
  7. gSchool of Psychology, University of Auckland, Auckland 1142, New Zealand;
  8. hSchool of Philosophy, Research School of the Social Sciences, Australian National University, 0200 Canberra, Australia; and
  9. iDepartment of Linguistic and Cultural Evolution, Max Planck Institute for History and the Sciences, 07745 Jena, Germany

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PNAS first published November 10, 2014; https://doi.org/10.1073/pnas.1408701111
Carlos A. Botero
aInitiative for Biological Complexity, Department of the Interior Southeast Climate Science Center, and
bDepartment of Biology, Washington University in St. Louis, St. Louis, MO 63130;
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  • For correspondence: c.a.botero@email.wustl.edu
Beth Gardner
cDepartment of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27695;
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Kathryn R. Kirby
dDepartment of Ecology & Evolutionary Biology and Department of Geography and Program in Planning, University of Toronto, Toronto, ON, Canada M5S 3E8;
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Joseph Bulbulia
eSchool of Art History, Classics and Religious Studies, Victoria University of Wellington, Wellington 6140, New Zealand;
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Michael C. Gavin
fDepartment of Human Dimensions of Natural Resources, Colorado State University, Fort Collins, CO 80523;
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Russell D. Gray
gSchool of Psychology, University of Auckland, Auckland 1142, New Zealand;
hSchool of Philosophy, Research School of the Social Sciences, Australian National University, 0200 Canberra, Australia; and
iDepartment of Linguistic and Cultural Evolution, Max Planck Institute for History and the Sciences, 07745 Jena, Germany
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  1. Edited by Ara Norenzayan, University of British Columbia, Vancouver, Canada, and accepted by the Editorial Board October 10, 2014 (received for review May 11, 2014)

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Significance

Here we show that the spatial prevalence of human societies that believe in moralizing high gods can be predicted with a high level of accuracy (91%) from historical, social, and ecological data. Using high-resolution datasets, we systematically estimate the relative effects of resource abundance, ecological risk, cultural diffusion, shared ancestry, and political complexity on the global distribution of beliefs in moralizing high gods. The methods presented in this paper provide a blueprint for how to leverage the increasing wealth of ecological, linguistic, and historical data to understand the forces that have shaped the behavior of our own species.

Abstract

Although ecological forces are known to shape the expression of sociality across a broad range of biological taxa, their role in shaping human behavior is currently disputed. Both comparative and experimental evidence indicate that beliefs in moralizing high gods promote cooperation among humans, a behavioral attribute known to correlate with environmental harshness in nonhuman animals. Here we combine fine-grained bioclimatic data with the latest statistical tools from ecology and the social sciences to evaluate the potential effects of environmental forces, language history, and culture on the global distribution of belief in moralizing high gods (n = 583 societies). After simultaneously accounting for potential nonindependence among societies because of shared ancestry and cultural diffusion, we find that these beliefs are more prevalent among societies that inhabit poorer environments and are more prone to ecological duress. In addition, we find that these beliefs are more likely in politically complex societies that recognize rights to movable property. Overall, our multimodel inference approach predicts the global distribution of beliefs in moralizing high gods with an accuracy of 91%, and estimates the relative importance of different potential mechanisms by which this spatial pattern may have arisen. The emerging picture is neither one of pure cultural transmission nor of simple ecological determinism, but rather a complex mixture of social, cultural, and environmental influences. Our methods and findings provide a blueprint for how the increasing wealth of ecological, linguistic, and historical data can be leveraged to understand the forces that have shaped the behavior of our own species.

  • religion
  • cultural evolution
  • environmental effects
  • ecological risk
  • supernatural beliefs

Footnotes

  • ↵1To whom correspondence should be addressed. Email: c.a.botero{at}email.wustl.edu.
  • Author contributions: C.A.B., J.B., and R.D.G. designed research; C.A.B. performed research; K.R.K. and M.C.G. contributed new reagents/analytic tools; C.A.B., B.G., K.R.K., J.B., M.C.G., and R.D.G. analyzed data; and C.A.B., J.B., and R.D.G. wrote the paper.

  • The authors declare no conflict of interest.

  • This article is a PNAS Direct Submission. A.N. is a guest editor invited by the Editorial Board.

  • This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1408701111/-/DCSupplemental.

Freely available online through the PNAS open access option.

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The ecology of religious beliefs
Carlos A. Botero, Beth Gardner, Kathryn R. Kirby, Joseph Bulbulia, Michael C. Gavin, Russell D. Gray
Proceedings of the National Academy of Sciences Nov 2014, 201408701; DOI: 10.1073/pnas.1408701111

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The ecology of religious beliefs
Carlos A. Botero, Beth Gardner, Kathryn R. Kirby, Joseph Bulbulia, Michael C. Gavin, Russell D. Gray
Proceedings of the National Academy of Sciences Nov 2014, 201408701; DOI: 10.1073/pnas.1408701111
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