Skip to main content
Log in

The NEP scale: measuring ecological attitudes/worldviews in an African context

  • Published:
Environment, Development and Sustainability Aims and scope Submit manuscript

Abstract

Given the significance of human behavior as a major driver of most environmental problems, it is generally agreed that efforts to promote global ecological and economic sustainability must now include attempts to understand public perceptions of, and attitudes toward, environmental issues. Research findings generally indicate that attitudes are important determinants of ecological behaviors, and over time, scientists have strived to develop sound measurement instruments for studying public environmental attitudes. Of these attitude measures, the New Ecological Paradigm (NEP) scale stands out as being the most widely accepted with documented validity and reliability. In this study, the NEP scale was used to examine environmental attitudes among 355 university students in Ibadan, Nigeria. Overall, the Nigerian students were found to have a lower endorsement of the pro-ecological ideologies included in the NEP compared with similar samples from other cultural contexts. However, a strong consensus was observed among the sample on the fragility of nature’s balance and possibility of eco-crisis facets of the NEP. The findings of the study are discussed in the context of relevant Nigerian social and cultural factors, and recommendations for future research are provided.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2

Similar content being viewed by others

References

  • Adeola, F. O. (1996). Environmental contamination, public hygiene, and human health concerns in the third world: The case of Nigerian environmentalism. Environment and Behavior, 28, 614–646.

    Article  Google Scholar 

  • Adeola, F. O. (1998). Cross-national environmentalism differentials: Empirical evidence from core and non-core nations. Society and Natural resources, 11, 339–364.

    Article  Google Scholar 

  • Ajzen, I., & Driver, B. L. (1992). Application of the theory of planned behavior to leisure choice. Journal of Leisure Research, 24, 207–213.

    Google Scholar 

  • Ajzen, I., & Fishbein, M. (1980). Understanding attitudes and predicting social behavior. Englewood Cliffs, NJ: Prentice Hall.

    Google Scholar 

  • Amburgey, J. W., & Thoman, D. B. (2012). Dimensionality of the new ecological paradigm: Issues of factor structure and measurement. Environment and Behavior, 44, 235–256.

    Article  Google Scholar 

  • Aoyagi-Usui, M., Henk, V., & Kuribayashi, A. (2003). Pro-environmental attitudes and behaviors: An international comparison. Human Ecology Review, 10, 23–31.

    Google Scholar 

  • Awori, A. (1994). An African perspective on environment and development, In: Voices from Africa, UN-NGLS series (no. 5) Sustainable Development, pt. 1. Retrieved from www.un-ngls.org/orf/documents/publications.en/. Accessed: May 18, 2011.

  • Babalola, F. D. (2011). Roles of and threats to Yoruba traditional beliefs in wilderness conservation in southwest Nigeria. In Watson, A., Murrieta-Saldivar, J. & McBride, B. (Eds). Science and stewardship to protect and sustain wilderness values: Ninth world wilderness symposium (pp. 125–129). November 6–13, 2009, Merida, Yucatan, Mexico. Proceedings RMRS-P64. Fort Collins: CO, USA.

  • Babalola, Y. T., Babalola, A. D. & Okhale, F. O. (2010). Awareness and accessibility of environmental information in Nigeria: Evidence from Delta state. Library Philosophy and Practice (e-journal). Paper 460. http://digitalcommons.unl.edu/libphilprac/460.

  • Bechtel, R. B., Corral-Verdugo, V., & Pinheiro, J. Q. (1999). Environmental belief systems: United States, Brazil, and Mexico. Journal of Cross-Cultural Psychology, 30, 122–128.

    Article  Google Scholar 

  • Behrens, K. (2010). Exploring African holism with respect to the environment. Environmental Values, 19, 465–484.

    Article  Google Scholar 

  • Blaikie, N. W. H. (1992). The nature and origins of ecological world views: An Australian study. Social Science Quarterly, 73, 144–165.

    Google Scholar 

  • Brechin, S. R. (1999). Objective problems, subjective values, and global environmentalism: Evaluating the postmaterialist argument and challenging a new explanation. Social Science Quarterly, 80, 793–809.

    Google Scholar 

  • Brechin, S. R., & Kempton, W. (1994). Global environmentalism: A challenge to the postmaterialism thesis? Social Science Quarterly, 75, 245–269.

    Google Scholar 

  • Brechin, S. R., & Kempton, W. (1997). Beyond postmaterialist values: National versus individual explanations of global environmentalism. Social Science Quarterly, 78, 16–20.

    Google Scholar 

  • Brooks, C., & Manza, J. (1994). Do changing values explain the new politics? A critical assessment of the postmaterialist thesis. The Sociological Quarterly, 35, 541–570.

    Article  Google Scholar 

  • Callicott, J. B. (1994). Earth’s insights: A survey of ecological ethics from the mediterranean basin to the Australian outback. Berkeley: University of California Press

  • Casey, P. J., & Scott, K. (2006). Environmental concern and behavior in an Australian sample within an ecocentric-anthropocentric framework. Australian Journal of Psychology, 58, 57–67.

    Article  Google Scholar 

  • Chatterjee, D. P. (2008). Oriental disadvantage versus occidental exuberance: Appraising environmental concern in India—A case study in a local context. International Sociology, 23, 5–33.

    Article  Google Scholar 

  • Chokor, B. A., & Mene, S. A. (1992). An assessment of preferences for landscapes in the developing world: Case study of Warri, Nigeria and environs. Journal of Environmental Management, 23, 237–256.

    Article  Google Scholar 

  • Clayton, S., & Myers, G. (2009). Conservation psychology: Understanding and promoting human care for nature (pp. 15–33). Oxford, UK: Blackwell.

    Google Scholar 

  • Clinebell, H. (1998). Understanding and counseling persons with alcohol, drug, and behavioral addictions. Nashville, TN: Abingdon.

    Google Scholar 

  • Corral-Verdugo, V., & Amendàriz, L. I. (2000). The ‘‘new environmental paradigm’’ in a Mexican community. Journal of Environmental Education, 31, 25–31.

    Article  Google Scholar 

  • Dunlap, R. E. (1994). International attitudes towards environment and development. In H. O. Bergesen & G. Parmann (Eds.), Green globe yearbook of international co-operation on environment and development 1994 (pp. 115–126). Oxford: Oxford University Press.

  • Dunlap, R. E. (2008). The New Environmental Paradigm Scale: From marginality to worldwide use. Journal of Environmental Education, 40, 3–18.

    Article  Google Scholar 

  • Dunlap, R. E., & Jones, R. E. (2002). Environmental concern: Conceptual and measurement issues. In R. E. Dunlap & W. Michelson (Eds.), Handbook of environmental sociology (pp. 482–524). Westport, CT: Greenwood Press.

    Google Scholar 

  • Dunlap, R., & Mertig, A. (1995). Global concern for the environment: Is affluence a prerequisite? Journal of Social Issues, 51, 121–138.

    Article  Google Scholar 

  • Dunlap, R. E., & Mertig, A. G. (1997). Global environmental concern: An anomaly for postmaterialism. Social Science Quarterly, 78, 24–29.

    Google Scholar 

  • Dunlap, R. E., & Van Liere, K. (1978). The new environmental paradigm. Journal of Environmental Education, 9, 10–19.

    Google Scholar 

  • Dunlap, R. E., Van Liere, K. D., Mertig, A. G., & Jones, R. E. (2000). Measuring endorsement of the new environmental paradigm: A revised NEP scale. Journal of Social Issues, 56, 425–442.

    Article  Google Scholar 

  • Dunlap, R. E., & York, R. (2008). The globalization of environmental concern and the limits of the postmaterialist values explanation: Evidence from four multinational surveys. The Sociological Quarterly, 49, 529–563.

    Article  Google Scholar 

  • Ebreo, A., Hershey, J., & Vining, J. (1999). Reducing solid waste: Linking recycling to environmentally-responsible consumerism. Environment and Behavior, 31, 107–135.

    Article  Google Scholar 

  • Egunjobi, L. (1993). Issues in environmental management for sustainable development in Nigeria. The Environmentalist, 13, 33–40.

    Article  Google Scholar 

  • Ehrlich, P., & Kennedy, D. (2005). Millennium assessment of human behavior. Science, 309, 562–563.

    Article  CAS  Google Scholar 

  • Eneji, C. V., Ntamu, G. U., Ajor, J. O., Ben, C. B., et al. (2012). Ethical basis of African traditional religion and socio-cultural practices in natural resources conservation and management in Cross River state, Nigeria. Journal of Research in Peace, Gender and Development, 2, 34–43.

    Google Scholar 

  • Erdoğan, N. (2009). Testing the new ecological paradigm scale: A Turkish case. African Journal of Agricultural Research, 4, 1023–1031.

    Google Scholar 

  • Fairbrother, M. (2012). Rich people, poor people, and environmental concern: Evidence across nations and time. European Sociological Review,. doi:10.1093/esr/jcs068.

    Google Scholar 

  • Fielding, K. S., Terry, D. J., Masser, B. M., & Hogg, M. A. (2008). Integrating social identity theory and the theory of planned behavior to explain decisions to engage in sustainable agricultural practices. British Journal of Social Psychology, 47, 23–48.

    Article  Google Scholar 

  • Franzen, A., & Meyer, R. (2010). Environmental attitudes in cross-national perspective: A multilevel analysis of the ISSP 1993 and 2000. European Sociological Review, 26, 219–234.

    Article  Google Scholar 

  • Freudenburg, W. R. (1991). Rural–urban differences in environmental concern: A closer look. Sociological Inquiry, 61, 167–198.

    Article  Google Scholar 

  • Grob, A. (1995). A structural model of environmental attitudes and behavior. Journal of Environmental Psychology, 15, 209–220.

    Article  Google Scholar 

  • Hawcroft, L. J., & Milfont, T. L. (2010). Use (and abuse) of the new environmental paradigm scale over the last 30 years: A meta-analysis. Journal of Environmental Psychology, 30, 143–158.

    Article  Google Scholar 

  • Heberlein, T. A. (1981). Environmental attitudes. Zeitschrift for Umweltpolitik, 2, 241–270.

    Google Scholar 

  • Heberlein, T. A. (1989). Attitudes and environmental management. Journal of Social Issues, 45, 37–57.

    Article  Google Scholar 

  • Himmelfarb, S. (1993). The measurement of attitudes. In A. H. Eagly & S. Chaiken (Eds.), The psychology of attitudes. Orland, FL: Harcourt Brace Javanovich.

    Google Scholar 

  • Hunter, L. M., Strife, S., & Twine, W. (2010). Environmental perceptions of rural South African residents: The complex nature of environmental concern. Society and Natural Resources, 23, 525–541.

    Article  Google Scholar 

  • Ibrahim, F. M., & Babayemi, O. F. (2010). Knowledge and attitude of a group of Nigerian undergraduates towards environmentalism. Global Journal of Environmental Research, 4, 47–53.

    Google Scholar 

  • Ikelegbe, A. (2005). The economy of conflict in the oil-rich Niger-Delta of Nigeria. Nordic Journal of African Studies, 14, 208–234.

    Google Scholar 

  • Inglehart, R. (1995). Public support for environmental protection: Objective problems and subjective values in 43 societies. Political Science and Politics, 28, 57–72.

    Google Scholar 

  • Iwilade, A. (2012). “Green” or “Red”? Reframing the environmental discourse in Nigeria. Africa Spectrum, 2–3, 157–166.

    Google Scholar 

  • Johnson, C. Y., Bowker, J. M., & Cordell, H. K. (2004). Ethnic variation in environmental belief and behavior. Environment and Behavior, 36, 157–186.

    Article  Google Scholar 

  • Kaiser, G. F., Ranney, M., Hartig, T., & Bowler, P. A. (1999). Ecological behavior, environmental attitudes and feelings of responsibility for the environment. European Psychologist, 4, 59–74.

    Article  Google Scholar 

  • Kelbassa, W. (2005). The rehabilitation of indigenous environmental ethics in Africa. Diogenes,207, 17–34.

    Google Scholar 

  • Kidd, Q., & Lee, A. (1997). Postmaterialist values and the environment: A critique and reappraisal. Social Science Quarterly, 78, 1–15.

    Google Scholar 

  • Kim, D. (1999). Environmentalism in developing countries and the case of a large Korean city. Social Science Quarterly, 80, 810–829.

    CAS  Google Scholar 

  • Kortenkamp, K. V., & Moore, C. F. (2006). Time, uncertainty, and individual differences in decisions to cooperate in resource dilemmas. Personality and Social Psychology Bulletin, 32, 603–615.

    Article  Google Scholar 

  • Kurz, T. (2002). The psychology of environmentally sustainable behavior: Fitting together pieces of the puzzle. Analyses of Social issues and Policy, 2, 257–278.

    Article  Google Scholar 

  • Labaran, B. (2010). Nigeria at 50: What does Naija mean? Retrieved from www.bbc.co.uk/news/world-africa-11447252. Jan 23, 2013.

  • Lalonde, R., & Jackson, E. L. (2002). The NEP scale: Has it outlived its usefulness? Journal of Environmental Education, 33, 28–36.

    Article  Google Scholar 

  • Lopez, G. A., & Cuervo-Arango, M. A. (2008). Relationship among values, beliefs, norms and ecological behavior. Psicothema, 20, 623–629.

    Google Scholar 

  • Mansaray, A., Ajiboye, J. O., & Audu, U. F. (1998). Environmental knowledge and attitudes of some Nigerian secondary school teachers. Environmental Education Research, 4, 329–339.

    Article  Google Scholar 

  • Mascia, B. M., Brosius, J. P., Dobson, T. A., Forbes, B. C., Horowitz, L., McKean, M. A., et al. (2003). Conservation and the social sciences. Conservation Biology, 17, 649–650.

    Article  Google Scholar 

  • Mbiti, J. S. (1969). African religions and philosophy. London: Heinemann.

    Google Scholar 

  • Mbiti, J. S. (1970). Concepts of God in Africa. London: SPCK.

    Google Scholar 

  • McKenzie-Mohr, D. (2000). Promoting sustainable behavior: An introduction to community-based social marketing. Journal of Social Issues, 56, 543–554.

    Article  Google Scholar 

  • Milfont, T. L. (2007). Psychology of environmental attitudes: A cross-cultural study of their content and structure. Unpublished doctoral dissertation, University of Auckland, Auckland, New Zealand.

  • Milfont, T. L. (2012). Cultural differences in environmental engagement. In S. Clayton (Ed.), Handbook of environmental and conservation psychology. Oxford: Oxford University Press.

    Google Scholar 

  • Milfont, L. T., & Duckitt, J. (2004). The structure of environmental attitudes: A first and second order confirmatory factor analysis. Journal of Environmental Psychology, 24, 289–303.

    Article  Google Scholar 

  • Millar, D. (1999). Traditional African worldviews from a cosmovision perspective. In B. Haverkort & W. Hiemstra (Eds.), Food for thought: Ancient visions and new experiments of rural people (pp. 131–138). London: Zed Books.

    Google Scholar 

  • Mobley, C., Vagias, W. M., & DeWard, S. L. (2010). Exploring additional determinants of environmentally responsible behavior: The influence of environmental literature and environmental attitudes. Environment and Behavior, 42, 420–447.

    Article  Google Scholar 

  • Murove, M. (2004). An African commitment to ecological conservation: The Shona concepts of ‘Ukama and Ubuntu’. Mankind Quarterly, 45, 195–215.

    Google Scholar 

  • Odion-Akhaine, S. (2009). The student movement in Nigeria: Antimonies and transformation. Review of African Political Economy, 121, 427–450.

    Article  Google Scholar 

  • Odoemene, A. (2011). Social consequences of environmental change in the Niger Delta of Nigeria. Journal of Sustainable Development, 4, 123–135.

    Article  Google Scholar 

  • Odufuwa, B. O., Adedeji, O. H., Oladesu, J. O., & Bongwa, J. (2012). Floods of fury in Nigerian cities. Journal of Sustainable Development, 5, 69–79.

    Google Scholar 

  • Ogunbode, C. A., & Arnold, K. (2012a). A study of environmental awareness and attitudes in Ibadan, Nigeria. Human and Ecological Risk Assessment: An International Journal, 18, 669–684.

    Article  CAS  Google Scholar 

  • Ogunbode, C. A., & Arnold, K. (2012b). Knowledge, Morality and Threat Perception: A juxtaposition of internal influences on climate change related behavioral intentions in Nigeria. Human and Ecological Risk Assessment: An International Journal. Just accepted. doi:10.1080/10807039.2012.729141.

  • Ogungbemi, S. (1997). An African perspective on the environmental crisis. In L. J. Pojman (Ed.), Environmental ethics: Readings in theory and application (2nd ed., pp. 330–337). Belmont, CA: Wadsworth Publishing Company.

    Google Scholar 

  • Ogunjimi, A. A., Onadeko, S. A., & Adewumi, A. A. (2012). An empirical study of the effects of personal factors on environmental attitudes of local communities around Nigeria’s protected areas. The Journal of Transdisciplinary Environmental Studies, 11, 40–53.

    Google Scholar 

  • Ojomo, P. A. (2010). An African understanding of environmental ethics. Thought and Practice: A Journal of the Philosophical Association of Kenya, 2, 49–63.

    Google Scholar 

  • Olli, E., Grendstad, G., & Wollebaek, D. (2001). Correlates of environmental behaviors: Bringing back social context. Environment and Behavior, 33, 181–208.

    Google Scholar 

  • Olofsson, A., & Öhman, S. (2006). General beliefs and environmental concern – Transatlantic comparisons. Environment and Behavior, 38, 768–790.

    Article  Google Scholar 

  • Oruonye, E. D. (2011). An assessment of the level of awareness of the effects of climate change among students of tertiary institutions in Jalingo metropolis. Journal of Geography and Regional Planning, 4, 513–517.

    Google Scholar 

  • Opoku, K. (1993). African traditional religions: An enduring heritage in religious plurality. In J. Olupona & S. Inyang (Eds.), Religious plurality in Africa. Berlin, New York: Monton de Gruyter.

  • Oskamp, S. (2000). A sustainable future for humanity? How can psychology help? American Psychologist, 55, 496–508.

    Article  CAS  Google Scholar 

  • Pahl, S., Harris, P., Todd, H. A., & Rutter, D. (2005). Comparative optimism for environmental risks. Journal of Environmental Psychology, 25, 1–11.

    Article  Google Scholar 

  • Parizanganeh, A., Lakhan, V. C., Yazdani, M., & Ahmad, S. R. (2011). Modelling categorical data to identify factors influencing concern for the natural environment in Iran. Journal of Environmental Management, 92, 2836–2843.

    Article  Google Scholar 

  • Pierce, J. C. (1997). The hidden layer of political culture: A comment on ‘Postmaterialist values and the environment’: A critique and reappraisal. Social Science Quarterly, 78, 30–35.

    Google Scholar 

  • Rauwald, K. S., & Moore, C. F. (2002). Environment attitudes as predictors of policy support across three countries. Environment and Behavior, 34, 709–739.

    Article  Google Scholar 

  • Rideout, B. E., Hushen, K., McGinty, D., Perkins, S., & Tate, J. (2005). Endorsement of the new environmental paradigm in systematic and e–mail samples of college students. Journal of Environmental Education, 36(2), 15–23.

    Article  Google Scholar 

  • Sandvik, H. (2008). Public concern over global warming correlates negatively with national wealth. Climatic Change, 90, 333–341.

    Article  CAS  Google Scholar 

  • Sarigöllü, E. (2009). A cross-country exploration of environmental attitudes. Environment and Behavior, 41, 365–386.

    Article  Google Scholar 

  • Schultz, P. W. (2002). Environmental attitudes and behaviors across cultures. Online readings in psychology and culture (Unit 8, Chapter 4): (http://orpc.iaccp.org). International Association for Cross-Cultural Psychology.

  • Schultz, P. W. (2011). Conservation means behavior. Conservation Biology, 25, 1080–1083.

    Article  Google Scholar 

  • Schultz, P. W., Gouveia, V. V., Cameron, L. D., Tankha, G., Schmuck, P., & Franek, M. (2005). Values and their relationship to environmental concern and conservation behavior. Journal of Cross-Cultural Psychology, 36, 457–475.

    Article  Google Scholar 

  • Schultz, P. W., Shriver, C., Tabanico, J. J., & Khazian, A. M. (2004). Implicit connections with nature. Journal of Environmental Psychology, 24, 31–42.

    Article  Google Scholar 

  • Schultz, P. W., Unipan, J. B., & Gamba, R. J. (2000). Acculturation and ecological worldview among Latino Americans. Journal of Environmental Education, 31, 22–27.

    Article  Google Scholar 

  • Schultz, P. W., & Zelezny, L. C. (1999). Values as predictors of environmental attitudes: Evidence for consistency across 14 countries. Journal of Environmental Psychology, 19, 255–265.

    Article  Google Scholar 

  • Scott, D., & Willits, F. K. (1994). Environmental attitudes and behavior. Environment & Behavior, 26, 239–260.

    Article  Google Scholar 

  • Shresta, A. (2009). Are we the blank generation? Questioning the dichotomous materialist/post -materialist value shift in post-world war II generations. Unpublished course paper. Department of Government, Uppsala University. Retrieved from www.nrndk.com/resources/Final%20Course%20Paper%20amit.pdf.

  • Stern, P. C. (1992). Psychological dimensions of global environmental change. Annual Review of Psychology, 43, 269–302.

    Article  Google Scholar 

  • Stern, P. C., Dietz, T., & Guagnano, G. A. (1995). The new ecological paradigm in social-psychological context. Environment and Behavior, 27, 723–743.

    Article  Google Scholar 

  • Taringa, N. (2006). How environmental is African traditional religion? Exchange, 35, 191–214.

    Article  Google Scholar 

  • Tarrant, M. A., & Cordell, H. K. (1997). The effect of respondent characteristics on general environmental attitude-behavior correspondence. Environment and Behavior, 29, 618–637.

    Article  Google Scholar 

  • Tremblay, K. R., & Dunlap, R. E. (1978). Rural-urban residence and concern with environmental quality: A replication and extension. Rural Sociology, 43, 474–491.

    Google Scholar 

  • Van Liere, K. D., & Dunlap, R. E. (1980). The social bases of environmental concern: A review of hypotheses, explanations, and empirical evidence. Public Opinion Quarterly, 44, 181–197.

    Article  Google Scholar 

  • Van Petegem, P., & Blieck, A. (2006). The environmental worldview of children: A cross-cultural perspective. Environmental Education Research, 12, 625–635.

    Article  Google Scholar 

  • Vikan, A. (2007). Endorsement of the new ecological paradigm scale: A comparison of two Brazilian and one Norwegian sample. Environment and Behavior, 39, 217–228.

    Article  Google Scholar 

  • White, M. J., & Hunter, L. M. (2009). Public perceptions of environmental issues in a developing setting: Environmental concern in coastal Ghana. Social Science Quarterly, 90, 960–982.

    Article  Google Scholar 

  • White, L. J., & Oates, J. F. (1999). New data on the history of the plateau forest of Okomu, southern Nigeria; an insight into how human disturbance has shaped the African rain forest. Global Ecology and Biogeography, 8, 355–361.

    Article  Google Scholar 

  • Whitmarsh, L. (2009). Behavioral responses to climate change: Asymmetry of intentions and impacts. Journal of Environmental Psychology, 29, 13–23.

    Article  Google Scholar 

  • Widegren, O. (1998). The new environmental paradigm and personal norms. Environment & Behavior, 30, 75–100.

    Article  Google Scholar 

  • World Rainforest Movement. (2002). The sacred forest: A community protected area. Retrieved from: http://wrm.org.uy/subjects/CBFM/book3.html#cotedIvoire. Accessed: Aug 23, 2011.

  • Yencken, D., Fein, J., & Sykes, H. (2000). Environment, education, and society in the Asia–Pacific. London: Routledge.

    Book  Google Scholar 

  • Zelezny, L. C., Chua, P. P., & Aldrich, C. (2000). Elaborating on gender differences in environmentalism. Journal of Social Issues, 56, 443–457.

    Article  Google Scholar 

Download references

Acknowledgments

The author would like to acknowledge Kate Arnold and three anonymous reviewers for their insightful and immensely helpful comments on previous drafts of this article.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Charles A. Ogunbode.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Ogunbode, C.A. The NEP scale: measuring ecological attitudes/worldviews in an African context. Environ Dev Sustain 15, 1477–1494 (2013). https://doi.org/10.1007/s10668-013-9446-0

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10668-013-9446-0

Keywords

Navigation