TS.B.6 Since AR5 there is increased evidence that climate hazards associated with extreme events and variability act as direct drivers of involuntary migration and displacement and as indirect drivers through deteriorating climate-sensitive livelihoods . Most climate-related displacement and migration occur within national boundaries, with international movements occurring primarily between countries with contiguous borders . Since 2008, an annual average of over 20 million people have been internally displaced annually by weather-related extreme events, with storms and floods being the most common . 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report