In the hills of Emilia-Romagna, dairy farmers have long followed rules etched in tradition. Cows graze only on local grass and hay. The resulting milk, combined with nothing more than salt and rennet, becomes Parmigiano Reggiano. An 800-year-old process. A global icon. And now, a sector under strain from rising temperatures that no amount of history can fully buffer.
Record heat this summer pushed thermometers past 40 degrees Celsius. Cows reacted as any mammal would. They lay down more. They ate less. Milk output fell by as much as 10 percent. Extreme heat impacts milk’s quality and quantity. Those words come from Nicola Bertinelli, president of the Parmigiano Reggiano Consortium and operator of a family dairy farm founded in 1895 near Parma. He spoke them to Reuters in mid-July as the latest wave intensified.
But the trouble runs deeper than one season’s shortfall. Grass withered under drought. Hay stocks thinned. Without rain, the strict geographic rules that define authentic Parmigiano leave producers with few substitutes. If it doesn’t rain, grass doesn’t grow, hay cannot be produced and it’s impossible to obtain the milk needed to make the cheese, Bertinelli added. Short, blunt. The sort of statement that lands harder than any forecast.
Downstream, costs compound. Warehouses that age hundreds of thousands of wheels must stay cool around the clock. Credito Emiliano, known locally as Credem, operates what insiders call the cheese bank. Its subsidiary, Magazzini Generali delle Tagliate, holds more than 500,000 wheels worth over €300 million as collateral for loans to farmers. The arrangement dates to 1953. It lets small operations unlock cash while their product matures for 12, 24, or even 36 months.
This year the math changed. During peak heat, daily energy consumption at the warehouses jumped about 30 percent. Giancarlo Ravanetti, who directs the warehouse operation, described the response to Reuters. Improved cooling systems. Better boilers. Upgraded insulation. More renewable power. All necessary. All expensive. The human factor remains key and is the real strength of the entire process, he said, striking a note of continuity amid adaptation.
Producers installed fans and water-mist systems in barns to ease stress on the herd. Those measures add their own bills. Paolo Ganzerli, international sales director at GranTerre, a food group that reported €1.87 billion in consolidated revenue for 2025, captured the broader worry. If extreme events become longer-lasting and more intense, they will certainly have an impact on both the quantity and quality of milk, but above all they will lead to higher costs. He told the same Reuters team. Then he added a line that lingers. Parmigiano Reggiano has existed for more than 800 years. We don’t want to be the last generation to eat it.
The numbers at stake command attention. The industry generates roughly €4.5 billion, or about $5.15 billion, in annual revenue. More than half the output ships abroad. The United States stands as the single largest importer. Roughly 300 certified dairies sustain thousands of jobs across the designated provinces. Disruptions here ripple outward. A Fortune report published just yesterday detailed how the same heat that shrinks milk yields now threatens the cheese banks themselves. Extreme temperatures raise the risk that wheels stored as loan collateral could spoil or lose value, tightening credit for farms already squeezed.
And the pressure extends beyond dairy. Italy’s wine and olive oil sectors show parallel stress. In Lombardy’s Franciacorta region, the 2026 grape harvest began on July 30, the earliest on record. Sicily’s picking season stretched across microclimates in what growers called a hundred-day effort. Coldiretti, the country’s largest farmers’ association, labeled the year one of the earliest nationally. Sugar rushes into grapes faster than flavor can follow. Late-ripening reds suffer most. Some vineyards now test shade netting once reserved for hail. Olive production in Puglia and Calabria fell to 270,000-300,000 tons in the latest season, well below the historical average above 350,000 tons.
R. Jisung Park, labor economist at the University of Pennsylvania’s Wharton School, connects these threads. In conversation with Fortune, he pointed to supply-chain spillovers. Heat shocks upstream translate into valuation hits downstream. A European Central Bank working paper noted that GDP losses from extreme heat register smaller in Italy and Spain than in Germany, partly because southern economies have adapted to warmth over time. Yet hidden costs accumulate. Delayed effects. Indirect losses. The kinds of impacts that models still struggle to price fully.
Italy’s broader economy faces similar warnings. A business group cited in recent coverage projected that extreme heat could trim national output by €6 billion to €12 billion annually, or 0.2 to 0.4 percent of GDP. That figure, while modest on paper, masks concentrated pain in agriculture and food processing. Parmesan production sits at the center of one such cluster.
Farmers have responded with technology. Blockchain now allows producers to pledge wheels as collateral without physically moving them to the bank’s vault, effectively doubling lending capacity. Quality checks continue with X-rays and the traditional hammer tap that listens for internal flaws. Tradition and innovation sit side by side. Still, the core vulnerability remains. The cows. The grass. The weather they depend on.
Recent coverage on X amplified the alarm. Users shared images of stressed herds and cooling systems. One post from mid-July noted how heat above 104 degrees Fahrenheit forces behavioral changes that cascade through the entire supply chain. Another highlighted the cheese banks, where hundreds of thousands of wheels now require extra energy just to survive storage. The conversation mixes concern with dark humor. Ratatouille jokes aside, the underlying message is serious. An industry built on predictability now confronts increasing variability.
Economists tracking these shifts see patterns repeating across Mediterranean agriculture. Higher nighttime temperatures reduce the recovery period for both plants and animals. Prolonged drought depletes soil moisture. Energy prices for cooling rise in tandem with demand. Each factor reinforces the others. The result is not a single breaking point but a steady erosion of margins that eventually forces structural change.
Producers insist they will adapt. They point to eight centuries of resilience. Yet the current combination of heat intensity and frequency tests that claim. Bertinelli’s family farm has operated since the late 19th century. Ganzerli’s company moves product to tables worldwide. Both men voice the same quiet fear. That this generation might witness the outer limits of what the old rules can sustain.
The cheese itself has not changed. Its three ingredients remain fixed by law. The land that feeds the cows faces new constraints. So does the power grid that keeps aging rooms at precise temperatures. In that tension lies the story. Not of inevitable collapse. But of a storied sector now calculating the true price of a warming climate, one wheel, one kilowatt-hour, one dry summer at a time.
Yesterday’s Fortune piece brought the financial angle into sharper focus. Cheese banks are not abstract heritage sites. They function as working credit mechanisms. When heat raises spoilage risk or operating costs, the loans secured against those wheels become more expensive or harder to obtain. The effect travels from barn to balance sheet with surprising speed. And from there, into Italy’s wider food economy.
Observers note that solutions exist. Selective breeding for heat-tolerant cattle. Improved irrigation. Expanded renewable capacity at warehouses. Greater flexibility in feed rules, though that path collides with protected designation rules that give Parmigiano its premium. Each option carries trade-offs. None offers a simple return to the climate of decades past.
So the industry watches the forecasts. Installs another fan. Checks the humidity in the aging rooms one more time. And wonders how many more summers like this one the 800-year tradition can absorb before something fundamental must give. The milk tells the first story. The balance sheets will write the next.