Climate Risks Are Redrawing the Insurance Map

In this thought-provoking discussion, Robin Castelli explores the growing tension between climate change, risk modeling, and the sustainability of insurance markets.

As acute and chronic physical climate risks increase—manifesting in more frequent wildfires, hurricanes, and flooding—insurance providers are either dramatically raising premiums or exiting high-risk markets entirely. These shifts are already evident in states like California and Florida, where major insurers are retreating, and state-backed insurers of last resort are only offering short-term relief.

This evolving reality presents a looming systemic risk. As properties become uninsurable, the value of mortgages tied to them could collapse, threatening the financial system. Compounding the issue is the use of outdated catastrophe models based on historical weather patterns, which fail to account for the shifting dynamics of a warming world. Castelli advocates for models grounded in forward-looking climate science and policy interventions that support both insurers and residents in exposed areas.

The future of insurability may hinge on our ability to reconcile accurate climate modeling with equitable long-term planning.