The six visualisations that accompany this piece show how climate risk has been working its way into insurance markets across the past decade. The patterns are sharper at the underlying data level than the broader public conversation has been registering.
Chart one
The first chart maps the per-capita property-insurance premium increases across the U.S. counties most affected by climate-related risks. The increases are not uniform; specific high-risk geographies have absorbed premium increases that approach 80 percent across the decade.
Chart two
The second chart shows the geographic withdrawal of major insurers from specific high-risk markets. Several major insurers have stopped writing new policies in defined regions of California, Florida, and the Texas Gulf Coast. The withdrawals have been gradual; the cumulative effect is significant.
Chart three
The third chart traces the growth of state-backed insurer-of-last-resort programmes in the affected geographies. The programmes have grown to cover larger shares of the underlying property markets than they were designed to cover. The financial sustainability of the programmes at current scale is a question the data raises.
Chart four
The fourth chart maps the reinsurance pricing increases that have flowed through the broader insurance market. Reinsurance is the part of the insurance industry that ultimately absorbs the largest climate-related catastrophic risks; the pricing increases have produced the upstream cost pressures that the primary-insurance markets have been responding to.
Chart five
The fifth chart traces the incidence of declared natural disasters by category over the past decade. The increase has been driven principally by specific categories — severe convective storms, wildfire events, and certain coastal flooding patterns — rather than by uniform increases across all categories.
Chart six
The sixth chart layers in the regulatory responses across the most-affected states. The responses have varied widely; the variation has produced different outcomes for the markets in those states.
What the charts together show
What the charts together show is that climate risk has already meaningfully affected the operating economics of insurance markets in the most-affected geographies. The pattern is intensifying. The implications for property values, for housing affordability, and for the broader fiscal stability of state-backed programmes are real and are not yet fully reflected in the broader policy conversation.
