The Burning Bill: Climate Change's True Economic Cost - Veritas Europaea

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The Burning Bill: How Global Warming Is Quietly Dismantling the World Economy

27.05.2026

Jan Bostl

World

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Estimated reading time: 15 minutes

The world’s economists spent decades treating climate change as a future problem. They built models that tucked the worst consequences safely into the second half of the century, expressed the damage in bloodless percentages, and concluded that the economic costs, while real, remained manageable. That consensus is now breaking apart—not under the pressure of ideology, but under the weight of accumulating data.

A 2024 working paper from the National Bureau of Economic Research sent shockwaves through the field when it found that each 1°C of global warming reduces world GDP by more than 20% in the long run—a figure dramatically larger than previous mainstream estimates. The same year, the University of Exeter and the Institute and Faculty of Actuaries in the United Kingdom published what they called a "Planetary Solvency" analysis, warning that business-as-usual emissions could halve global GDP by as early as 2070. Meanwhile, a 2025 study in Nature Climate Change found that economists had been systematically underestimating losses by focusing only on local weather impacts; when researchers factored in global weather interactions, projected end-of-century GDP losses jumped from roughly 11 percent to nearly 40 percent.

These are not fringe figures. They come from refereed journals, Nobel laureate collaborators, and the world’s most respected economic institutions. And yet governments continue to make trillion-dollar infrastructure and fiscal decisions as though the cost of inaction remains modest. This investigation examines exactly what that inaction is already costing—and what it promises to cost next.

This is a piece of slow journalism.

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The Measurement Problem—And Why the Real Number Is Worse Than You Think

For decades, the dominant framework for pricing climate damage was built on models developed in the 1990s—tools never designed to capture tipping points, cascading failures, or the interconnected nature of a globalized economy. William Nordhaus, who won the 2018 Nobel Prize in Economics for his climate modeling work, famously estimated that 6°C of warming would reduce global GDP by just 8.5 percent. That figure, once standard in policy circles, now strikes many climate economists as dangerously optimistic.

The problem is methodological. Most early models measured only how local temperature changes affected local national output. They missed the fact that climate is a global system: a drought in Brazil does not merely threaten Brazilian agriculture—it reshapes global soy prices, strains European food systems dependent on Brazilian imports, and triggers cascading shocks across dozens of unrelated supply chains. When researchers at MIT and affiliated institutions corrected for this global interconnectedness, the loss estimates multiplied dramatically.

"There is a clear need for better understanding of the mechanisms behind widely divergent estimates of climate-driven global economic losses, and more comprehensive representation of their drivers in estimation methods. These improvements would produce a more reliable range of estimates that decision-makers could use to guide their efforts to mitigate and adapt to climate change."

Jennifer Morris, Principal Research Scientist, MIT Center for Sustainability Science and Strategy — 2025

Five-fold spread in GDP

Morris and her colleagues reviewed the most prominent structural economic models and found that, at 3°C of warming, estimates of GDP loss ranged from less than 1 percent to 5 percent—a five-fold spread that makes any single-point policy decision arbitrary. But those structural models still exclude entire categories of damage: ecosystem service collapse, biodiversity loss, mass migration, geopolitical conflict, and the non-linear amplification of cascading disasters. "That might sound small," Morris told the MIT Climate Portal about even the higher estimates, "but with global GDP, those are really big numbers."

The NBER’s landmark 2024 paper went further still. By exploiting natural variability in global temperature data rather than relying on country-level proxies, researchers found that a single degree of warming reduces world GDP by more...