Climate change will have a growing influence on the stability of the banking system, potentially contributing to future financial crises. A paper published in Nature Climate Change late last year highlights the detrimental effects of climate change on the banking system, adding to established literature on the effects of climate change on economic growth and productivity of labour. However, financial regulation authorities can act to reduce climate-related risks by implementing targeted measures.
The category 5 Hurricane Katrina struck land in Florida and Louisiana in 2005, bringing extensive damage to the city of New Orleans and causing over 1,200 deaths: the deadliest hurricane in the United States since 1928. Not only were the homes and livelihoods of millions of people affected, with over one million people displaced, but Katrina also had pervasive economic effects, leading the Federal Deposit Insurance Corporation (FDIC) to report that 10 percent of banks in the area suffered net losses, and almost 50 percent felt the brunt of the storm thorough net losses on loans. In fact, the FDIC stated in the aftermath, “From a financial standpoint, the biggest source of uncertainty and concern for Gulf Coast financial institutions is the effect of the post-hurricane damage on credit quality.”
Although it is inaccurate to attribute single extreme weather events to climate change, it is accurate to state that climate change leads to an increased frequency of such events. Hurricane Katrina is just one of many examples of the profound repercussions that extreme weather can have on financial institutions, whereby extreme weather impacts the stability of banks and the financial sector as a whole. Therefore, it is important to focus the efforts of both policymakers and academic research on understanding how financial institutions are exposed to climate risks and what they can do in response.
The Effects of Climate Change on the Financial Sector
An influential report, published by the scientific journal Nature Climate Change, and entitled “The public costs of climate-induced financial instability,” addresses the role of the financial sector in dealing with the consequences of climate change on production activities. Francesco Lamperti, coauthor of the paper and postdoctoral research fellow at the Institute of Economics, Scuola Superiore Sant’Anna, and junior scientist at the European Institute on Economics and the Environment (RFF and CMCC), explains that the “paper provides robust evidence on the role of the financial sector in absorbing or exacerbating the losses and damages that climate change exerts on production activities.” Lamperti further elaborates by noting, “On one side, we show that climate change might have negative impacts on the stability of banks, with long-run consequences for governments, public debt, and future generations. On the other, our paper points to the fact that when banks are under stress because of accumulating losses, they reduce credit provision to businesses and real activities, thus exacerbating the negative effects of climate change.”
Although the paper in no way claims to be able to predict when and where climate-induced financial crises will occur, it does give an indication of the mechanisms that bring about these crises, leading to the conclusion that climate change goes hand in hand with increased probability of financial crises.
Specifically, an increase in climate-related extreme events, including floods and storms, would put infrastructure at risk and hence affect banks and insurance companies, and in turn raise premiums. In fact, the report states that climate change increases the frequency of banking crises (from 26 percent up to 248 percent), while rescuing insolvent banks will cause an additional fiscal burden of approximately 5 percent to 15 percent of gross domestic product (GDP) per year and an increase of public debt to GDP by a factor of two in the year 2100.
“The main result is that climate damages significantly reverberate to the financial system,” explains coauthor Massimo Tavoni, director of RFF-CMCC European Institute on Economics and the Environment and professor at Politecnico di Milano. “Our results clearly show that firms’ survival likelihood reduces almost three times, while the risk of banking crises doubles.”
The effects on the financial system have also been reported by other sources. For example, the idea that “climate change makes investments riskier, blunts workers’ productivity, and shakes up monetary stability” has been reported and discussed by prominent economists.
Federal Reserve Chair Jerome Powell outlined how extreme weather events “have the potential to inflict serious damage on the lives of individuals and families, devastate local economies (including financial institutions), and even temporarily affect national economic output and employment.” In fact, in the United States alone, it is estimated that damage from severe weather has impacted insurers substantially, costing them upwards of $50 billion in 2018, explains San Francisco Federal Reserve Bank President Mary Daly. “This impacts banks’ customers, making it harder for them to satisfy their loan obligations,” Daly continues. “And this can ultimately stress banks’ balance sheets. So, ensuring financial institutions are regularly evaluating their exposure to climate-related risks is an increasingly important part of our work.”
Financial Regulation Can Make a Difference
But it isn’t all bad news. The report also chooses to focus on the possible measures that financial regulation authorities can implement to manage and reduce climate-related risks, therefore providing valuable insights for policymakers and suggestions for future academic research.
In particular, monetary policy and macroprudential regulation are outlined as effective tools with which to mitigate such risks. According to coauthor Lamperti, “Banks exposed toward clients that are located in areas at high risk of climate-related impacts might be requested to increase their capital and liquidity requirements. This is similar to what recent advances in macroprudential regulation foresee for periods of excessive credit growth: when the supply of credit excessively increases with respect to real economic activities (production), the risk that some—potentially many—of these loans won’t be repaid rises as well, and banks are thus requested to increase the amount of capital (equity) they need to hold relative to their total assets. A similar mechanism might be designed to account for climate risks.”
The financial sector must be accounted for in climate-economy integrated assessment, as its omission may lead to an underestimation of climate impacts. Furthermore, financial regulation can play a central role in mitigating these impacts and creating a more resilient global economy that can implement effective climate change mitigation and adaptation strategies.
CMCC Foundation, Editorial Production Support