Most documented examples of international climate-related migration are intra-regional movements of people between countries with shared borders . Systematic reviews find few documented examples of long-distance, inter-regional migration driven by climate events . One macro-economic analysis found a correlation between migrant flows from low- to high-income countries and adverse climatic events in the source country . Another study found that high heat stimulates higher rates of international migration from middle-income countries but typically not from low-income countries , while other studies found international climate-related migration originates primarily from agriculture-dependent countries . Small-sample studies of migrants to Canada from Bangladesh, Haiti and sub-Saharan Africa suggest environmental factors in the source country can be a primary or secondary motivation for some migrants within larger flows of economic and family-reunification migrants . Research on the links between climate hazards and international movements of refugees and/or asylum seekers shows differing results. One study found that asylum applications in Europe increase during climate fluctuations due to interactions with conflict , and another found links between heat, drought, conflict and asylum-seeking migration originating in the Middle East between 2011 and 2015 . Other studies have found that
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report