Country-specific effects of climate variability on human migration
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Involuntary human migration is among the social outcomes of greatest concern in the current era of global climate change. Responding to this concern, a growing number of studies have investigated the consequences of short to medium-term climate variability for human migration using demographic and econometric approaches. These studies have provided important insights, but at the same time have been significantly limited by lack of expertise in the use of climate data, access to cross-national data on migration, and attention to model specification. To address these limitations, we link data on internal and international migration over a 6-year period from 9812 origin households in Kenya, Uganda, Nigeria, Burkina Faso and Senegal to high-resolution gridded climate data from both station and satellite sources. Analyses of these data using several plausible specifications reveal that climate variability has country-specific effects on migration: Migration tends to increase with temperature anomalies in Uganda, tends to decrease with temperature anomalies in Kenya and Burkina Faso, and shows no consistent relationship with temperature in Nigeria and Senegal. Consistent with previous studies, precipitation shows weak and inconsistent relationships with migration across countries. These results challenge generalizing narratives that foresee a consistent migratory response to climate change across the globe.
KeywordsNigeria Temperature Anomaly International Migration Land Surface Temperature Climatic Research Unit
The authors are grateful for assistance and constructive comments from M. Gutmann and A. Henley. The participation of C.G. was supported by the National Institutes of Health (R00HD061752).
- Blaikie P, Brookfield H (1987) Land degradation and society. Methuen, LondonGoogle Scholar
- Buis M (2009). POSTRCSPLINE: Stata module containing post-estimation commands for models using a restricted cubic spline http://ideas.repec.org/c/boc/bocode/s456928.html
- Houghton J, Callander B, Varney S (1992) Climate change 1992: the supplementary report to the IPCC scientific assessment. Cambridge University Press, Cambridge, UKGoogle Scholar
- IPCC (2014) 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, eds field CB, et al. Cambridge Univ Press, New YorkGoogle Scholar
- Plaza S, Navarrete M, Ratha D (2011) Migration and remittances household surveys in Sub-Saharan Africa: methodological aspects and main findings. World Bank, Washington, DCGoogle Scholar
- Stark O, Bloom D (1985) The new economics of labor migration. Am Econ Rev 75:173–178Google Scholar
- UEACRU (University of East Anglia Climatic Research Unit), Jones P, Harris I (2013) CRU TS3.21: Climatic Research Unit (CRU) Time-Series (TS) Version 3.21 of High Resolution Gridded Data of Month-by-month Variation in Climate (Jan. 1901- Dec. 2012). doi:10.5285/D0E1585D-3417-485F-87AE-4FCECF10A992.Google Scholar