environmental refugee
Refers to people forced to leave their homes due to environmental degradation or climate change.
Climate change is increasing the number of environmental refugees.
The islanders became environmental refugees due to rising sea levels.
難民 is a general term for refugees, while 環境難民 specifically refers to those displaced by environmental factors.
Compound of 環境 (environment) and 難民 (refugee), a calque of English 'environmental refugee'.