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The escalating frequency and severity of extreme weather-related events shine a brighter regulatory spotlight on insurance risk and climate change, and all eyes in the insurance industry are on Australia this summer.

The Bushfire and Natural Hazards Cooperative Research Centre is already forecasting above-normal fire conditions for parts of Australia. Last year, record-breaking temperatures and months of severe drought fuelled a series of massive bushfires across Australia. More than 11 million hectares were devastated, and insured losses were estimated at up to A$1.9 billion.

In 2018, natural disasters killed more than 10,000 people and left millions more homeless. In the same year, natural catastrophe-related economic losses reached US$160 billion (A$215 billion) (half of which were all insured losses). The vast majority – 95 per cent – of the registered events were weather-related.

Insurers are recognising that the mid- to long-term outlook on climate change carries some massive risks. With Australia at the centre of a geographic region adversely affected by climate change, it is imperative for the insurance industry to assess and manage the adverse impacts of extreme weather to ensure Australia’s climate resilience.

So what does the insurance industry need to do to become more resilient against climate change and to protect people from potentially devastating financial and human losses? A new study based in the US offers some insights.

Facing the heat: climate change and mortality

A recent paper, Joint Extremes in Temperature and Mortality: A Bivariate POT Approach, examines insurance risk management by jointly modelling extreme climate risk and extreme mortality risk. Climate change directly impacts the insurance sector, since catastrophic weather events and mortality experience can simultaneously trigger large losses across different lines of the insurance business, according to Professor Qihe Tang, Director of Research in the School of Risk & Actuarial at UNSW Business School, and his co-author Dr Han Li, Senior Lecturer in the Department of Actuarial Studies and Business Analytics at Macquarie Business School.

Their study is amongst the first to explore the unique relationship between extreme climate and extreme mortality from an actuarial perspective, and their approach can be easily adapted for future research on related topics such as the impact of climate change on health insurance. A key challenge in modelling extreme risks is the scarcity of observations. 

Fortunately, extreme value theory (EVT) can be used to provide results beyond observed values. To model the extreme dependence between temperature and mortality, the authors employed a cutting-edge bivariate “peaks over threshold” (POT) approach. "As a simplified example, if we know a higher than usual temperature on a day, the bivariate POT allows us to estimate the likelihood of a higher than usual number of deaths that day. The study quantifies the extreme dependence between death counts and temperature indexes for different age groups and across different geographical regions in the US," the authors explain.

In the paper, the authors note the World Health Organization (WHO) is expecting 250,000 additional deaths annually between 2030 to 2050 due to climate change-induced intense temperature fluctuations and climate-sensitive diseases. One of the aims of their research is to produce broader impacts on society, in promoting climate resilience in the insurance sector, as well as in protecting vulnerable segments of the population.

“Our age-region-specific analysis of joint extremes in temperature and mortality shows that the levels of exposure and resilience to extreme weather vary across different geographical regions and age groups. We also find that the frequency of extremely low temperatures has a stronger impact on mortality, especially for older ages,” say the authors.

Practical steps

Looking ahead, better risk awareness from the life insurance industry, as well as innovative risk mitigation tools such as mortality catastrophe (CAT) bonds can help to build a more sustainable insurance sector and economy, and ultimately a more climate-resilient society.

So what practical steps can the insurance industry implement? Firstly, the industry needs better risk awareness. “Climate-related research is in urgent demand to better understand the implications of climate change for insurance industries. In the enterprise risk management framework, we need to first identify and understand the risk, and then quantify and mitigate the risk,” the paper says.

Second, the industry should incorporate environmental factors in insurance pricing. “Besides traditional insurance pricing factors, scenario-based analysis should be considered to project future claim experience under different climate conditions,” say the authors.

Finally, insurance-linked securities (ILS) offer a risk mitigation solution. For example, mortality catastrophe (CAT) bonds have been used as a risk mitigation tool by many large reinsurance companies  – such as AIG, Axa and Allianz – to transfer extreme mortality risk to the capital market. Such a solution can go a long way to promote resilience in the industry, and in turn, its ability to manage the risks posed by climate change.