Bank activities and the evolving exposures of banks and society to climate disasters

Research finds that climate disasters have had minimal effects on banks’ performance to date, and it has devoted limited attention to how banks shape societal exposure to the disasters. This study addresses this puzzle and gap. Examining the share price reactions of banks affected by billion-dollar disasters from 1994–2024, we find that on average these banks lost market value around the disasters exceeding 10 percent of the estimated damages, with this percentage more than doubling during the sample period. We next show that banks’ county-level mortgage lending is positively associated with property exposures to disasters and FEMA appropriations when disasters occur. Finally, we show that banks open new branches in counties that experience growth in socially advantaged population, especially counties with high climate risks. Given accelerating climate change, property-casualty insurers backing away from climate-risky counties, and FEMA’s uncertain status, our evidence highlights growing climate-related costs for banks and society.