Fair Climate Policy Needs More Than Carbon Pricing, EU Study Finds

What does a fair climate policy actually look like? For years, economists have answered that question with a deceptively simple recipe: put a price on carbon, hand the revenue back to citizens as an equal dividend, and let the poorest households come out ahead. A new study published in Nature Climate Change by a team at the European Commission’s Joint Research Centre, together with a researcher at the ZHAW School of Management and Law, now shows that this recipe, while mathematically elegant, misses a crucial dimension of fairness that may explain why carbon pricing keeps running into political trouble. Analysing more than 260,000 households across 25 European Union member states, the researchers demonstrate that a policy can be fair on average and still feel deeply unfair to individual families, and that only a carefully balanced package of pricing, regulation, subsidies and transfers can resolve the resulting dilemma.

The team, led by Toon Vandyck and including Umed Temursho, Florian Landis, David Klenert and Matthias Weitzel, built their analysis around three comprehensive, budget-neutral scenarios that all deliver the same target: a 55 percent reduction in net greenhouse gas emissions by 2030 compared with 1990 levels. The first scenario relies purely on regulation, tightening renewable energy and efficiency directives, vehicle CO2 standards and building performance rules. The second leans entirely on price signals, strengthening the existing Emissions Trading System and extending it to buildings and road transport through the new ETS2, with all additional revenue recycled as uniform lump-sum transfers to households. The third, called the mix scenario, combines enhanced regulation with a moderate carbon price and splits the extra revenue between household transfers and subsidies for decarbonising residential buildings.

To trace how these policies ripple through the economy, the researchers coupled a detailed bottom-up energy system model, PRIMES, with an economy-wide computable general equilibrium model, JRC-GEM-E3, calibrated on the GTAP 10 database. This hybrid framework captures how carbon prices and technology costs propagate through supply chains into consumer prices, and how they simultaneously affect wages and capital returns in factor markets. The results were then mapped onto harmonised household survey data, merging the Household Budget Survey with the Statistics on Income and Living Conditions through a random hot-deck statistical matching procedure, producing a dataset that records both what each household spends and where its income comes from.

The headline finding concerns the difference between two kinds of equity. Vertical equity describes how policy burdens are distributed across income groups, from the poorest to the richest decile. Horizontal equity describes how evenly the burden falls within each income group, among households that are otherwise similarly situated. When the researchers measured welfare impacts as compensating variation relative to household income, they found that average impacts per decile were remarkably modest, ranging between roughly minus one and plus one percent across all scenarios. Yet the variation within each decile dwarfed the differences between deciles, confirming earlier evidence from the United States that within-group dispersion is the dominant feature of climate policy impacts.

Each instrument shaped this dispersion in a distinctive way. The carbon-price scenario with uniform transfers was mildly progressive on average, because the poorest decile received more in dividends than it lost to higher energy prices. But the transfers were uncorrelated with household energy intensity, so two neighbours with identical incomes could experience sharply different outcomes depending on how much fossil fuel they still burned. Research cited in the study suggests that in Germany, a carbon tax with lump-sum transfers would leave around 70 percent of households worse off despite its progressive design, a pattern that helps explain limited political support. The regulation scenario, by contrast, compressed within-group differences by avoiding a direct price on remaining emissions, but it was mildly regressive overall, since standards raise relative costs for low-income households that spend a larger share of their income on energy, and it generated no revenue to compensate them.

The decomposition of impacts revealed three distinct channels. The expenditure side produced the strongest regressive effects, driven by the fact that residential energy expenditure shares fall as income rises. The transfer channel delivered large relative gains at the bottom of the distribution but also created unequal gains within lower deciles, because the same absolute dividend represents a different relative amount for households with slightly different incomes. The income channel proved surprisingly important: even modest wage changes contributed meaningfully to both between- and within-group variability, because labour income constitutes the bulk of household resources. Carbon pricing raises the cost of energy-intensive production, and part of that cost is borne by labour and capital, compounding pre-existing distortions in factor markets in what economists call the tax-interaction effect. Stricter standards, modelled as an implicit tax on energy inputs with a rebate on output, produced more muted wage effects.

To compare the scenarios on a principled footing, the team constructed a social welfare metric that combines two established frameworks. The first, rooted in Atkinson’s classic work on inequality measurement, embeds aversion to income inequality through a parameter epsilon, ranging from zero, which reduces the metric to a pure efficiency test, to two, which places heavy social weight on the poorest households. The second component adds a horizontal equity penalty, scaled by a weight gamma between zero and one, that deducts from social welfare when households within the same income decile experience divergent impacts, drawing on concepts of equal sacrifice and loss aversion. Setting gamma to zero recovers the canonical inequality-aversion framework, while setting epsilon to zero recovers a purely horizontal perspective, with a continuum of hybrid views in between.

The results of this evaluation were striking. When aversion to income inequality was high, the carbon-tax-and-transfer design won out, echoing earlier findings on the poverty and inequality dividends of price-based policies with compensating transfers. But that dominance broke down when inequality aversion was moderate or low, or when the horizontal equity weight was sufficiently large. With no income inequality aversion and moderate horizontal concern, pure regulation emerged as the preferred option, because standards limit factor market distortions and narrow the within-group impact spread. For moderate inequality aversion combined with meaningful horizontal equity concern, the mixed package of standards, prices, subsidies and transfers outperformed both alternatives, using carbon pricing to lift low-income households through transfers while subsidies, which directly target the households bearing retrofit and technology costs, compressed the within-group distribution of impacts.

The authors argue that this provides an explicit, quantified, equity-based rationale for the comprehensive climate policy packages observed in many countries, over reliance on any single instrument. The findings arrive at a politically charged moment: the European Parliament and Council recently postponed the introduction of ETS2 by one year and adjusted the Market Stability Reserve, decisions that showcase how distributional questions sit at the heart of EU climate politics. The study notes that uniform transfers are inherently temporary, since revenue streams dry up as emissions approach zero, whereas targeted subsidies and standards can shield households from higher energy prices while limiting horizontal disparities and keeping carbon prices in check. The researchers point to the Member State Social Climate Plans as an opportunity to weigh both equity dimensions, while cautioning that future work should incorporate home ownership patterns, energy poverty, incomplete subsidy take-up, wealth inequality and richer labour market heterogeneity. The broader message is that fairness in climate action is not a single dial to be tuned, but a balance to be struck, and that striking it well may be the key to making the transition to climate neutrality politically durable.

Subject of Research: Distributional equity impacts of EU climate policy packages combining carbon pricing, regulation, subsidies and transfers

Article Title: Enhancing fairness in climate action through policy packages

Article References: Enhancing fairness in climate action through policy packages. (n.d.). https://doi.org/10.1038/s41558-026-02751-5

Image Credits: AI Generated

DOI: 10.1038/s41558-026-02751-5

Keywords: climate policy, carbon pricing, horizontal equity, vertical equity, revenue recycling, EU Emissions Trading System, energy transition, policy design, household welfare, computable general equilibrium, climate justice, subsidies