Nature risk won't net out across a portfolio

Responsible Investor's latest commentary argues that nature risk cannot be netted out across a portfolio. The evidence is a European summer in which wildfire redrew the Tour de France. Stages were cut short. The men's final run into Paris changed as emergency services peeled off toward Gironde fires, and on Mont Ventoux spectators were barred from forests judged too risky in the heat.

The scale helps. More than 530,000 hectares have burned in the EU and UK, reaching as far north as the Scottish Cairngorms. Wildfire is among the fastest-growing catastrophe perils, and it now accounts for about 10 percent of insured losses. Wildfire-linked catastrophe bond issuance has already cleared $5 billion this year, with insurers routing exposure to capital markets.

A wheel of Parmigiano Reggiano carries the argument. The cheese is loan collateral for farmers, and heat stresses pasture and warehouse cooling alike, so asset values move directly. Parmigiano Reggiano is a Protected Designation of Origin product, so producing it elsewhere would change the asset itself. The 36-month maturation period means the heat's effect on production lands on balance sheets years later.

Then there is water. The Landes forest grows on former wetlands drained in the nineteenth century. Over 85 percent of global wetland areas have been lost. Drier ecosystems now face heat without the water buffer they once had.

Parmesan's protected designation bars the standard hedge: move production to a cooler region and the asset is no longer Parmesan. The lag alone pushes the damage three years down the line. Portfolio managers can neither relocate the cheese nor speed the aging.