Climate change triggers migration, particularly in middle-income
countries

Date:
September 14, 2020
Source:
Potsdam Institute for Climate Impact Research (PIK)
Summary:
Environmental hazards affect populations worldwide and can drive
migration under specific conditions. Changes in temperature levels,
increased rainfall variability, and rapid-onset disasters, such
as tropical storms, are important factors as shown by a new study.

Environmental migration is most pronounced in middle-income and
agricultural countries but weaker in low-income countries, where
populations often lack resources needed for migration.



FULL STORY ========================================================================== Environmental hazards affect populations worldwide and can drive migration under specific conditions. Changes in temperature levels, increased
rainfall variability, and rapid-onset disasters, such as tropical
storms, are important factors as shown by a new study led by the Potsdam Institute for Climate Impact Research (PIK). Environmental migration is
most pronounced in middle-income and agricultural countries but weaker in low-income countries, where populations often lack resources needed for migration. The findings make it possible to identify geographical regions
that may be especially susceptible to migration movements in the future.


========================================================================== "Environmental factors can drive migration, but the size of the effects
depends on the particular economic and sociopolitical conditions in
the countries," says lead author Roman Hoffmann from PIK and the Vienna Institute of Demography of the Austrian Academy of Sciences. "In both
low and high income countries environmental impacts on migration are
weaker -- presumably because either people are too poor to leave and
become basically trapped, or, in wealthy countries, have enough financial
means to absorb the consequences. It is mainly in regions with middle
incomes and a dependency on agriculture that we see strong effects." Environmental impacts differ by contexts and types of hazards The
meta-study, which analyzed 30 previously published studies on the
topic, reveals a number of fascinating patterns. It shows, for example,
that impacts on migration vary by types of environmental hazards and
that different hazards can re-inforce each other. "While changing
temperatures in a region are found to have the strongest impact on
migration, also rapid-onset disasters and changing rainfall variability
and anomalies can play a role. Especially smallholder farmers rely on
steady climatic conditions and suffer from changes and shocks as they
have insufficient capacities to adapt," says co-author Raya Muttarak
from the International Institute of Applied Systems Analysis and the Wittgenstein Centre for Demography and Global Human Capital (IIASA,
VID/O"AW, University of Vienna).

The researchers emphasize that there is no automatism at play --
environmental migration always depends on a number of economic and sociopolitical factors.

The narrative of climate refugees pushing towards Europe or the US may be
too simplistic. For instance, the researchers found compelling evidence
that environmental changes in vulnerable countries predominantly lead to internal migration or migration to other low- and middle-income countries, rather than cross-border migration to high-income countries. Affected populations often migrate to places within their own region and eventually return to their homes within a relatively short period of time.

Localizing potential migration hotspots The findings, published in the
latest issue of Nature Climate Change, also hint at regions highly
vulnerable to climate change where environmental migration may be
particularly prevalent. "Our research suggests that populations in Latin America and the Caribbean, several countries in Sub-Saharan Africa,
especially in the Sahel region and East Africa, as well as Western,
South and Southeast Asia are particularly at risk," says co-author Anna Dimitrova from the Vienna Institute of Demography, Austrian Academy
of Sciences.

Given the expected rise of the global average temperature the researchers believe that the topic of environmental migration will become more
important in the future. Consequently, interventions have to be tailored
to the actual situations on the ground that reduce vulnerabilities. "The
best way to protect those affected is to stabilize the global climate,
namely to rapidly reduce greenhouse gas emissions from burning fossil
fuels," concludes Jesus Crespo Cuaresma from the Vienna University of
Economics and Business and IIASA. "While migration can be an effective adaptation strategy for households, it can be involuntary and come
with unacceptable human suffering -- unacceptable because it indeed can
be avoided."

========================================================================== Story Source: Materials provided by Potsdam_Institute_for_Climate_Impact_Research_(PIK).

Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Hoffmann, R., Dimitrova, A., Muttarak, R. et al. A meta-analysis of
country-level studies on environmental change and
migration. Nat. Clim.

Chang., 2020 DOI: 10.1038/s41558-020-0898-6 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/09/200914112228.htm

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