Insurance is the New Diversification

By Nidia Martinez, Ph.D

People and businesses often believe that if they can renew their insurance program year after year, they have “climate change coverage.” That is a misconception.

Insurance covers losses from specific events—e.g., hurricanes, floods, wildfires—under defined terms and conditions. It does not cover the underlying trend driving those events.

And it has no obligation to renew contracts year after year.

While climate change is often described in terms of rising average temperatures, the average conceals what matters most for risk. Natural catastrophes do not emerge from the mean—they emerge from the tail of the distribution. Yet it is the shift in the mean that reshapes that tail. As the distribution moves, extremes become more likely and more severe. This is what ultimately drives losses.

Catastrophe models incorporate a short-term view of the future, but they still operate within constraints. Having catastrophe insurance does not insure you against climate change. If you have hurricane insurance and a hurricane strikes, you will receive a payment according to your contract.

But if that continues to happen year after year, the situation changes.

Premiums increase. Terms tighten. Capacity may be reduced or withdrawn.

Over time, this can reach a tipping point—where an asset becomes either unaffordable to insure or uninsurable altogether.

You may no longer be able to insure the asset at a reasonable cost, or at all. We are beginning to see this shift in certain states and for certain perils.

Insurance is designed to absorb shocks, not to carry a continuously deteriorating risk profile. When losses become more frequent and severe, the system adjusts.

This is not a failure of insurance—it is how it is meant to work.

In many cases, insurance is no longer functioning purely as a risk transfer mechanism. It has become a requirement—something individuals and businesses must have to access financing, such as a mortgage. Yet in some instances, that insurance is either unavailable or prohibitively expensive. While there are temporary mechanisms to address these gaps, they are not sustainable over time. As a result, access to financing can be affected, with potential implications for lenders and, more broadly, financial stability.

When I first joined the insurance industry, one principle stood above all others: diversification. Risk had to be spread—across geographies, perils, and portfolios. Lessons from events like Hurricane Katrina reinforced the importance of avoiding concentration.

The assumption was that losses would not occur everywhere at once.

But climate risk is challenging that assumption. We are increasingly seeing frequent and severe events across multiple regions within a single policy term. In that context, diversification alone becomes insufficient.

In that context, resilience becomes the new diversification. It is no longer just about where risk is located, but about how it is reduced.

Diversification spreads risk. Resilience reduces it. We need both.

The responsibility does not sit only with the insurer.

It sits with all of us—asset owners, businesses, governments, and the financial system that depends on insurability.

Insurance helps us recover from loss. It reduces the financial burden, but it does not reduce risk. That is our job—and that is where adaptation comes in.

It is up to us to remain insurable. It is up to the industry and to governments to determine what it takes to keep assets insurable.

How? By understanding and quantifying present and future risk—and by investing in adaptation.

Industries like hospitality are already investing hundreds of millions of dollars in resilience. The insurance market should recognize those investments, quantify the reduction in risk, and reflect it in insurance programs.

This can incentivize further investment in resilience, creating a virtuous cycle that is independent of market cycles or ad hoc discounts.

What You Can Do

First, understand your exposure. Are you at risk from flooding, windstorms, extreme heat, freezes, wildfire, drought, or sea level rise?

Second, accept that some risks cannot be eliminated. We cannot stop a heatwave or water scarcity on our own. Let us focus instead on what we can control.

Third, understand whether natural systems are protecting you. Coral reefs, mangroves, sand dunes, levees, and well-managed forests can significantly reduce risk. These benefits can be quantified and reflected in insurance premiums – ask your insurer or broker – they can help.

Simple steps matter:

• Landscaping can absorb water or slow wildfire spread.

• Strong garage doors can prevent structural failure.

• Roof integrity prevents water intrusion.

• Insulation protects against heat and cold.

• Providing natural shade and frequent breaks helps those working under an open sky.

• Levees can significantly reduce flood risk.

• Ecological forestry management – research has quantified a 40% decrease in wildfire insurance premium in Northern California.

If you live along the coast, coral reefs, mangroves, and levees can significantly reduce risk. These natural defenses (i.e.: nature-based solutions or NBS) can fundamentally change your risk profile.

There are abundant literature and research on resilience and retrofitting. For example, the

Insurance Institute for Business & Home and Safety (IBHS) an independent non-for-profit organization,  delivers top-tier science and translates it into action so we can prevent avoidable suffering, strengthen our homes and businesses, inform the insurance industry, and support thriving communities

Know your exposure. Know your risk. Own your adaptation.

Climate risk is already here. It will continue to evolve.

The question is not whether we believe in it.

The question is how we prepare for it.

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