Future climate-related migration is expected to vary by region and over time, according to future climatic drivers, patterns of population growth, adaptive capacity of exposed populations and international development and migration policies . The wide range of potential outcomes is reflected in model projections of population displacements by 2050 in Latin America, sub- Saharan Africa and south Asia due to climate change, which vary from 31 million to 143 million people, depending on assumptions about future GHG emissions and socioeconomic development trajectories . With every additional one degree Celsius of warming, the global risks of involuntary displacement due to flood events are projected to rise by approximately 50% . High emissions/low development scenarios raise the potential for higher levels of migration and involuntary displacement  and increase the need for planned relocations and support for people exposed to climate extremes but lacking the means to move  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report