Climate change is projected to increase migration, especially internal and rural to urban migration . With 1.7℃ global warming by 2050, 17-40 million people could migrate internally in sub-Saharan Africa, increasing to 56- 86 million for 2.5°C  due to water stress, reduced crop productivity and sea level rise. This is a lower-bound estimate excluding rapid-onset hazards such as floods and tropical cyclones. 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report