As the planet warms and catastrophe losses escalate, the global insurance industry finds itself at a crossroads – awash in climate-fueled volatility, under pressure to close protection gaps, and increasingly reliant on capital from outside its own ranks.
In the first six months of 2025 alone, natural disasters caused $162 billion in economic losses worldwide, with insurers absorbing $100 billion of that figure - the second-highest half-year total for insured catastrophe losses in history, according to data from Aon. While that milestone reflects improvements in insurance penetration, particularly in the United States, it also underscores a structural fragility: outside wealthy economies, protection remains elusive and undercapitalized.
“We are clearly on a pathway now of 2.7 degrees or 3 degrees where adaptation is simply not doable anymore. This is just what it is. We cannot protect Amsterdam from sea level rise of three meters. This is just not doable,”Günther Thallinger, board member at Allianz, told CNBC
The concentration of insured losses in the United States - more than 90% of the global total - masks the widening disparities elsewhere. Flooding in Australia, a catastrophic glacier collapse in Switzerland, and mounting wildfire damage in California all contributed to the surge in losses this year. Yet in many developing economies, risk remains largely uninsured.
“If this volume just grows even more, we simply have a societal situation that is not bearable anymore because it is just too much risk that is no longer covered,”continued Thallinger.
The global protection gap – the share of catastrophe losses not covered by insurance – fell to 38% in 2025, the lowest on record. But that global figure belies deeply uneven progress. In much of Asia, Africa, and Latin America, large segments of populations remain exposed to extreme weather events without financial safety nets.
To bridge that gap, the industry is now looking beyond its own balance sheets. Greg Case, chief executive of Aon, has called for $1 trillion in new private capital investment over the next decade – a sum he says is necessary to sustain the insurance sector’s role in absorbing economic shocks.
“If we don’t bring in a trillion dollars in alternative capital in the next decade, we’ve failed,” said Case, speaking to the Financial Times.
Already, more than $115 billion in alternative capital has been committed to structures such as catastrophe bonds, sidecars, and reinsurance-linked securities. But Case sees room for much more, noting that traditional carriers are increasingly retrenching in high-risk segments. “To the extent we can access other pools of capital… we want to bring as much in as we can, to offset the volatility that our clients face,” he said.
As more insurers withdraw from risky territories — or raise premiums sharply — entire regions are becoming increasingly difficult to insure. The Los Angeles wildfires earlier this year, now estimated to be the costliest wildfire event ever, revealed the vulnerability of even highly developed economies.
Zurich Insurance Group described the global outlook as “alarmingly bleak” in an April report, warning that the cost of insured losses has outpaced global GDP growth by more than double over the past three decades. “If insured losses continue to grow at this rate, premiums for climate risk coverage will need to increase to reflect the additional risk,” said the report’s authors. “This, in turn, will affect the level of protection that individuals and businesses are willing and able to purchase.”
Thallinger echoed the concern about mounting insurability challenges:“There are many people who are actually talking about how you cannot insure certain assets. It’s very, very difficult to deal with these assets as an investor.”
While some reinsurers like Munich Re maintain that rising temperatures do not necessarily make insurance unviable -“It’s all about the question of price,” said chief climate scientist Tobias Grimm in an interview with CNBC - others fear the global model of insurability is approaching a fundamental breaking point.
The World Economic Forum, in a report published today, argues that the role of insurers must shift decisively from traditional risk transfer to more proactive forms of risk management and mitigation. That includes embedding climate science into underwriting, collaborating with governments to implement climate-resilient infrastructure standards, and scaling public-private partnerships to fund adaptation in underserved regions.
The insurance sector, once the backstop of last resort, is increasingly being asked to serve as architect of a new climate resilience framework. That shift - from passive payer to active partner - may be the industry’s most consequential transformation yet.
