Global migration is driven by the complex interplay between environmental and social factors

Venla Niva*, Marko Kallio, Raya Muttarak, Maija Taka, Olli Varis, Matti Kummu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Migration manifests an important response and adaptation measure to changes in the environment and socioeconomic conditions. In a time when environmental stressors and risks are unprecedentedly increasing, understanding the interplay between the underlying factors driving migration is of high importance. While the relationships between environmental and socioeconomic drivers have been identified conceptually, the comprehensive global-scale spatial quantification of their interactions is in its infancy. Here, we performed a geospatial analysis of gridded global net migration from 1990 to 2000 using a novel machine learning approach which analyses the interplay between a set of societal and environmental factors simultaneously at the place of origins (areas of net-negative migration) and destinations (areas of net-positive migration). We diagnosed the importance of eight environmental and societal factors in explaining migration for each country, globally. Nearly half of global in- and out-migration took place in the areas characterized by low adaptive capacity and high environmental stress. Regardless of the income level, income was the key factor in explaining net-migration in half of the countries. Slow-onset environmental factors, drought and water risk, were found to be the dominant environmental variables globally. Our study highlights that factors representing human capacity need to be incorporated into the quantitative diagnosis of environmental migration more rigorously.

Original languageEnglish
Article number114019
Number of pages16
JournalEnvironmental Research Letters
Volume16
Issue number11
DOIs
Publication statusPublished - Nov 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • human migration
  • adaptive capacity
  • drivers of migration
  • environmental stress
  • integrated approach
  • random forest analysis
  • grid cell
  • CLIMATE-CHANGE
  • POPULATION
  • RESILIENCE
  • FUTURE

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