Thresholds in climate migration

Original Paper

Abstract

Migration in response to climatic hazards or changes in climatic conditions can unfold in a variety of ways, ranging from barely observable, incremental changes in pre-existing migration flows to abrupt, non-linear population movements. The adoption of migration instead of in situ adaptation responses, and the high degree of variability in potential migration outcomes, in part reflects the presence of thresholds or tipping points within the processes of human-environment interaction through which climate adaptation and migration take place. This article reviews and makes linkages between existing research in climate adaptation, migration system dynamics, residential preferences, and risk perception to identify and explore the functioning and importance of thresholds. Parochial examples from the author’s published research on climate adaptation and migration in rural North America are used to illustrate. Six types of thresholds in response to climate hazards are identified: (1) Adaptation becomes necessary; (2) Adaptation becomes ineffective; (3) Substantive changes in land use/livelihoods become necessary; (4) In situ adaptation fails, migration ensues; (5) Migration rates become non-linear; and (6) Migration rates cease to be non-linear. Movement across thresholds is driven by context-specific characteristics of climate events, natural systems, and/or human systems. Transition from incremental to non-linear migration can be accelerated by people’s perceptions, by actions of influential individuals or groups, and by changes in key infrastructure, services, or other community assets. Non-linear climate migration events already occur at local and sub-regional scales. The potential for global scale, non-linear population movements later this century depends heavily on future greenhouse gas emission trends. The ability to identify and avoid thresholds that tip climate migration into a non-linear state will be of growing concern to policy makers and planners at all levels in coming decades. This article forms part of a special issue of this journal dedicated to the late Graeme Hugo, and the author draws heavily on past research by Professor Hugo and colleagues.

Keywords

Climate migration Climate adaptation Threshold Tipping point Non-linear behavior Migration dynamics Residential preference Risk perception 

References

  1. Adger, W. N., Lorenzoni, I., & O’Brien, K. L. (2009). Adaptation now. In W. N. Adger, I. Lorenzoni, & K. L. O’Brien (Eds.), Adapting to climate change: thresholds, values, governance (pp. 1–22). Cambridge: Cambridge University Press.CrossRefGoogle Scholar
  2. Ahamad, M. G., et al. (2011). Seasonal unemployment and voluntary out-migration from Northern Bangladesh. Mod Econ, 2, 174–179.CrossRefGoogle Scholar
  3. Asian Development Bank. (2012). Addressing climate change and migration in Asia and the Pacific. Manila: Asian Development Bank.Google Scholar
  4. Bardsley, D. K., & Hugo, G. J. (2010). Migration and climate change: examining thresholds of change to guide effective adaptation decision-making. Popul Environ, 32(2–3), 238–262.CrossRefGoogle Scholar
  5. Behringer, W. (2010). A cultural history of climate. Malden: Polity Press.Google Scholar
  6. Birkmann, J., et al. (2010). Adaptive urban governance: new challenges for the second generation of urban adaptation strategies to climate change. Sustain Sci, 5(2), 185–206.CrossRefGoogle Scholar
  7. Black, R. (2011). Climate change: migration as adaptation. Nature, 478, 447–449.CrossRefGoogle Scholar
  8. Black, R., et al. (2011). The effect of environmental change on human migration. Glob Environ Chang, 21(S1), S3–S11.CrossRefGoogle Scholar
  9. Black, R., et al. (2013). Migration, immobility and displacement outcomes following extreme events. Environ Sci Policy, 27(S1), S32–S43.CrossRefGoogle Scholar
  10. Carson, M., et al. (2016). Coastal sea level changes, observed and projected during the 20th and 21st century. Clim Chang, 134(1), 269–281.CrossRefGoogle Scholar
  11. Castles, S., de Haas, H., & Miller, M. J. (2013). The age of migration: international population movements in the modern world (5th ed.). New York: Palgrave Macmillan.Google Scholar
  12. de Haas, H. (2010). The internal dynamics of migration processes: a theoretical inquiry. J Ethn Migr Stud, 36(10), 1587–1617.CrossRefGoogle Scholar
  13. de Sherbinin, A. (2014). Climate change hotspots mapping: what have we learned? Clim Chang, 123(1), 23–37.CrossRefGoogle Scholar
  14. DeConto, R. M., & Pollard, D. (2016). Contribution of Antarctica to past and future sea-level rise. Nature, 531, 591–597.CrossRefGoogle Scholar
  15. DeWaard, J., Curtis, K. J., & Fussell, E. (2016). Population recovery in New Orleans after Hurricane Katrina: exploring the potential role of stage migration in migration systems. Popul Environ, 37(4), 449–463.CrossRefGoogle Scholar
  16. Dieng, H. B., et al. (2017). New estimate of the current rate of sea level rise from a sea level budget approach. Geophys Res Lett, 44(8), 3744–3751.CrossRefGoogle Scholar
  17. Duncan, O. D. (1935). Population trends in Oklahoma. Stillwater: Oklahoma Agricultural Experiment Station.Google Scholar
  18. Epstein, G. S. (2008). Herd and network effects in migration decision-making. J Ethn Migr Stud, 34(4), 567–583.CrossRefGoogle Scholar
  19. Fawcett, J. (1989). Networks, linkages, and migration systems. Int Migr Rev, 23(3), 671–680.CrossRefGoogle Scholar
  20. Foresight: migration and global environmental change. (2011). Final project report. London: Government Office for Science.Google Scholar
  21. Füssel, H.-M. (2007). Adaptation planning for climate change: concepts, assessment approaches, and key lessons. Sustain Sci, 2(2), 265–275.CrossRefGoogle Scholar
  22. Fussell, E., Sastry, N., & VanLandingham, M. (2010). Race, socioeconomic status, and return migration to New Orleans after Hurricane Katrina. Popul Environ, 31(1–3), 20–42.CrossRefGoogle Scholar
  23. Garschagen, M., & Romero-Lankao, P. (2015). Exploring the relationships between urbanization trends and climate change vulnerability. Clim Chang, 133(1), 37–52.CrossRefGoogle Scholar
  24. Gilbert, G., & McLeman, R. (2010). Household access to capital and its effects on drought adaptation and migration: a case study of rural Alberta in the 1930s. Popul Environ, 32(1), 3–26.CrossRefGoogle Scholar
  25. Gladwell, M. (2000). The tipping point: how little things can make a big difference. New York: Little, Brown and Company.Google Scholar
  26. Granovetter, M. (1978). Threshold models of collective behavior. Am J Sociol, 83(6), 1420–1443.CrossRefGoogle Scholar
  27. Gray, C. L., & Mueller, V. (2012). Natural disasters and population mobility in Bangladesh. Proc Natl Acad Sci, 109(16), 6000–6005.CrossRefGoogle Scholar
  28. Gregory, J. N. (1989). American exodus: the dust bowl migration and Okie culture in California. New York: Oxford University Press.Google Scholar
  29. Grodzins, M. (1958). The metropolitan area as a racial problem. Pittsburgh: University of Pittsburgh Press.Google Scholar
  30. Gunderson, L. (2000). Ecological resilience—in theory and application. Annu Rev Ecol Syst, 31, 425–439.CrossRefGoogle Scholar
  31. Holling, C. S. (1973). Resilience and stability of ecological systems. Annu Rev Ecol Syst, 4, 1–23.CrossRefGoogle Scholar
  32. Hugo, G. (1996). Environmental concerns and international migration. Int Migr Rev, 30(1), 105.CrossRefGoogle Scholar
  33. Hugo, G. (1998). The demographic underpinnings of current and future international migration in Asia. Asia and Pacific Migration Journal, 7(1), 1–25.CrossRefGoogle Scholar
  34. Hugo, G. (2005). The new international migration in Asia. Asian Population Studies, 1(1), 93–120.CrossRefGoogle Scholar
  35. Hugo, G. (2008). Migration, development and environment. Geneva: International Organization for Migration.Google Scholar
  36. Hugo, G. (2011). Future demographic change and its interactions with migration and climate change. Glob Environ Chang, 21(SI), S21–S33.CrossRefGoogle Scholar
  37. Hugo, G., & Bardsley, D. K. (2014). Migration and environmental change in Asia. In E. Piguet & F. Laczko (Eds.), Migration and environmental change in Asia (pp. 21–48). Dordrecht: Springer.Google Scholar
  38. Hugo, G., Bardsley, D. K., Tan, Y., Sharma, V., Williams, M., & Bedford, R. (2009). Climate change and migration in the Asia-Pacific region. Unpublished report to the Asian Development Bank. Manila: Asian Development Bank.Google Scholar
  39. IPCC (2013). Climate Change 2013: The Physical Science Basis. In T. F. Stocker, D. Qin, G.-K. Plattner, M. Tignor, S. K. Allen, J. Boschung, A. Nauels, Y. Xia, V. Bex and P. M. Midgley (Eds.), Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. United Kingdom and New York, NY, USA: Cambridge University Press, Cambridge.Google Scholar
  40. IPCC (2014). Summary for policymakers. In C. B. Field, V. R. Barros, D. J. Dokken, K. J. Mach, M. D. Mastrandrea, T. E. Bilir, M. Chatterjee, K. L. Ebi, Y. O. Estrada, R. C. Genova, B. Girma, E. S. Kissel, A. N. Levy, S. MacCracken, P. R. Mastrandrea, and L. L. White (Eds.), Climate Change 2014: Impacts, Adaptation, and Vulnerability. Part A: Global and Sectoral Aspects. Contribution of Working Group II to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (pp. 1–32). United Kingdom and New York, NY, USA: Cambridge University Press, Cambridge.Google Scholar
  41. Jordan, A., et al. (2013). Going beyond two degrees? The risks and opportunities of alternative options. Clim Pol, 13(6), 751–769.CrossRefGoogle Scholar
  42. Keizer, P. S., Gajewski, K., & McLeman, R. (2015). Forest dynamics in relation to multi-decadal late-Holocene climatic variability, eastern Ontario, Canada. Rev Palaeobot Palynol, 219, 106–115.CrossRefGoogle Scholar
  43. Khandker, S. R., Khalily, M. A. B., & Samad, H. A. (2012). Seasonal migration to mitigate income seasonality: evidence from Bangladesh. J Dev Stud, 48(8), 1063–1083.CrossRefGoogle Scholar
  44. Kiem, A. S., & Asutin, E. K. (2013). Drought and the future of rural communities: opportunities and challenges for climate change adaptation in regional Victoria, Australia. Glob Environ Chang, 23(5), 1307–1316.CrossRefGoogle Scholar
  45. King, R., & Skeldon, R. (2010). “Mind the gap!” integrating approaches to internal and international migration. J Ethn Migr Stud, 36(10), 1619–1646.CrossRefGoogle Scholar
  46. Kniveton, D., Smith, C., & Wood, S. (2011). Agent-based model simulations of future changes in migration flows for Burkina Faso. Glob Environ Chang, 21(S1), S34–S40.CrossRefGoogle Scholar
  47. Koubi, V., Spilker, G., Schaffer, L., & Böhmelt, T. (2016). The role of environmental perceptions in migration decision-making: evidence from both migrants and non-migrants in five developing countries. Population and Environment, 38(2), 134–163.Google Scholar
  48. Laforge, J., & McLeman, R. (2013). Social capital and drought-migrant integration in 1930s Saskatchewan. Can Geogr, 57(4), 488–505.CrossRefGoogle Scholar
  49. Lamb, H. H. (1982). Climate history and the modern world. London: Methuen.CrossRefGoogle Scholar
  50. Lee, T. M., et al. (2015). Predictors of public climate change awareness and risk perception around the world. Nat Clim Chang, 5, 1014–1020.CrossRefGoogle Scholar
  51. Mabogunje, A. (1970). Systems approach to a theory of rural-urban migration. Geogr Anal, 2, 1–18.CrossRefGoogle Scholar
  52. Mallick, B., & Vogt, J. (2012). Cyclone, coastal society and migration: empirical evidence from Bangladesh. Int Dev Plan Rev, 34(3), 217–240.CrossRefGoogle Scholar
  53. Massey, D. S. (1990). Social structure, household strategies, and the cumulative causation of migration. Population Index, 56, 3–26.CrossRefGoogle Scholar
  54. Massey, D. S., & Espinosa, K. E. (1997). What’s driving Mexico-US migration? A theoretical, empirical and policy analysis. Am J Sociol, 102(4), 939–999.CrossRefGoogle Scholar
  55. McLeman, R. (2006). Migration out of 1930s rural eastern Oklahoma: insights for climate change research. Great Plains Quarterly, 26(1), 27–40.Google Scholar
  56. McLeman, R. (2010). Impacts of population change on vulnerability and the capacity to adapt to climate change and variability: a typology based on lessons from a hard country. Popul Environ, 31(5), 286–316.CrossRefGoogle Scholar
  57. McLeman, R. (2011). Settlement abandonment in the context of global environmental change. Glob Environ Chang, 21(S1), S108–S120.CrossRefGoogle Scholar
  58. McLeman, R. (2014). Climate and human migration: past experiences, future challenges. New York: Cambridge University Press.Google Scholar
  59. McLeman, R., & Ford, J. D. (2013). How demographic change and migration influence community-level adaptation to climate change: examples from rural eastern Ontario and Nunavut, Canada. In T. Faist & J. Schade (Eds.), Disentangling migration and climate change: methodologies, political discourses, and human rights (pp. 55–79). Berlin: Springer.CrossRefGoogle Scholar
  60. McLeman, R., & Ploeger, S. K. (2012). Soil and its influence on rural drought migration: insights from depression-era southwestern Saskatchewan, Canada. Popul Environ, 33(4), 304–332.CrossRefGoogle Scholar
  61. McLeman, R., & Smit, B. (2006). Migration as an adaptation to climate change. Clim Chang, 76(1–2), 31–53.CrossRefGoogle Scholar
  62. McLeman, R., et al. (2008). Drought adaptation in rural eastern Oklahoma in the 1930s: lessons for climate change adaptation research. Mitig Adapt Strateg Glob Chang, 13(4), 379–400.CrossRefGoogle Scholar
  63. McLeman, R., et al. (2010). GIS-based modeling of drought and historical population change on the Canadian Prairies. J Hist Geogr, 36, 43–55.CrossRefGoogle Scholar
  64. McLeman, R., et al. (2011). Opportunities and barriers for adaptation in Canadian rural and resource-based communities. In J. Ford & L. B. Ford (Eds.), Climate change adaptation in developed nations (pp. 449–460). Dordrecht: Springer.CrossRefGoogle Scholar
  65. Meze-Hausken, E. (2008). On the (im-)possibilities of defining human climate thresholds. Clim Chang, 89(3–4), 299–324.CrossRefGoogle Scholar
  66. Morris, S. S., & Wodon, Q. (2003). The allocation of natural disaster relief funds: Hurricane Mitch in Honduras. World Dev, 31(7), 1279–1289.CrossRefGoogle Scholar
  67. Mortreux, C., & Barnett, J. (2009). Climate change, migration and adaptation in Funafuti, Tuvalu. Glob Environ Chang, 19(1), 105–112.CrossRefGoogle Scholar
  68. Murphy, C., Noone, S., Duffy, C., Broderick, C., Matthews, T., & Wilby, R. (2017). Irish droughts in newspaper archives: Rediscovering forgotten hazards. Weather, 72(6), 151–155.Google Scholar
  69. Nawrotzki, R., & DeWaard, J. (2016). Climate shocks and the timing of migration from Mexico. Popul Environ, 38(1), 72–100.CrossRefGoogle Scholar
  70. Nawrotzki, R. J., et al. (2017). Climate shocks and rural-urban migration in Mexico: Exploring nonlinearities and thresholds. Clim Chang, 140(2), 243–258.CrossRefGoogle Scholar
  71. Nelson, R., et al. (2010). The vulnerability of Australian rural communities to climate variability and change: part II—integrating impacts with adaptive capacity. Environ Sci Pol, 13(1), 8–17.CrossRefGoogle Scholar
  72. Pandolfi, J. M., et al. (2011). Projecting coral reef futures under global warming and ocean acidification. Science, 333(6041), 418–422.CrossRefGoogle Scholar
  73. Preston, B. L., Dow, K., & Berkhout, F. (2013). The climate adaptation frontier. Sustainability, 5(3), 1011–1035.CrossRefGoogle Scholar
  74. Romero-Lankao, P., et al. (2014). North America. In V. R. Barros et al. (Eds.), Climate change 2014: Impacts, adaptation, and vulnerability. Part B: regional aspects. Contribution of Working Group II to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (pp. 1439–1498). Cambridge: Cambridge University Press.Google Scholar
  75. Saha, S. K. (2016). Cyclone Aila, livelihood stress, and migration: empirical evidence from coastal Bangladesh. Disasters.  https://doi.org/10.1111/disa.12214.
  76. Sander-Regier, R., et al. (2010). Planning for climate change in Canadian rural and resource-based communities. Environments, 37(1), 35–57.Google Scholar
  77. Schade, J., Faist, T., & McLeman, R. (2015). Conclusion: inequality and migration as adaptation: where do we go from here? In R. McLeman, J. Schade, & T. Faist (Eds.), Environmental migration and social inequality (pp. 203–228). Dordrecht: Springer.Google Scholar
  78. Schelling, T. C. (1978). Micromotives and macrobehavior. New York: W.W. Norton & Company.Google Scholar
  79. Semenza, J. C., et al. (2008). Public perception of climate change: voluntary mitigation and barriers to behavior change. Am J Prev Med, 35(5), 479–487.CrossRefGoogle Scholar
  80. Shen, S., & Gemenne, F. (2011). Contrasted views on environmental change and migration: the case of Tuvaluan migration to New Zealand. Int Migr, 49(S1), e224–e242.Google Scholar
  81. Smit, B., & Skinner, M. (2002). Adaptation options in agriculture to climate change: a typology. Mitig Adapt Strateg Glob Chang, 7(1), 85–114.CrossRefGoogle Scholar
  82. Smit, B., & Wandel, J. (2006). Adaptation, adaptive capacity and vulnerability. Glob Environ Chang, 16(3), 282–292.CrossRefGoogle Scholar
  83. Smith, C. D. (2014). Modelling migration futures: development and testing of the rainfalls agent-based migration model—Tanzania. Climate and Development, 6(1), 77–91.CrossRefGoogle Scholar
  84. Speare, A. (1974). Residential satisfaction as an intervening variable in residential mobility. Demography, 11(2), 173–188.CrossRefGoogle Scholar
  85. Stark, O., & Bloom, D. E. (1985). The new economics of labor migration. The american economic review, 75(2), 173–178.Google Scholar
  86. Tacoli, C. (2009). Crisis or adaptation? Migration and climate change in a context of high mobility. Environ Urban, 21(2), 513–525.CrossRefGoogle Scholar
  87. van Aalst, M., Cannon, T., & Burton, I. (2008). Community level adaptation to climate change: the potential role of participatory community risk assessment. Glob Environ Chang, 18(1), 165–179.CrossRefGoogle Scholar
  88. Warner, K., & Afifi, T. (2014). Where the rain falls: evidence from 8 countries on how vulnerable households use migration to manage the risk of rainfall variability and food insecurity. Climate and Development, 6(1), 1–17.CrossRefGoogle Scholar
  89. Weber, E. U. (2010). What shapes perceptions of climate change? Wiley Interdiscip Rev Clim Chang, 1(3), 332–342.CrossRefGoogle Scholar
  90. Wolpert, J. (1966). Migration as an adjustment to environmental stress. J Soc Issues, 22(4), 92–102.CrossRefGoogle Scholar

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Authors and Affiliations

  1. 1.Department of Geography and Environmental StudiesWilfrid Laurier UniversityWaterlooCanada

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