Carbon Taxes Range From 11 Cents to $170 for the Same Ton of CO2

A ton of carbon dioxide costs $169.71 to emit in Norway and $0.11 in Poland, according to Tax Foundation Europe's 2026 survey of carbon taxes across the continent. The size of that gap, not the existence of carbon pricing itself, is what now separates a carbon tax that changes behavior from one that mostly exists on paper.

Eighty Pricing Systems Now Cover More Than a Quarter of Global Emissions

The economic case for taxing carbon comes from Arthur Pigou's argument that when an activity imposes a cost on people outside the transaction, a tax equal to that external cost restores the right incentive. Applied to carbon dioxide, the idea is simple. Applied in practice, it has taken 35 years to produce a patchwork of national rates rather than a single global price.

According to the World Bank's State and Trends of Carbon Pricing 2025 report, 80 carbon taxes and emissions trading systems are now in force worldwide, made up of 43 explicit carbon taxes and 37 trading systems. Together they cover 28 percent of global greenhouse gas emissions, up from 24 percent the year before and from 7 percent a decade earlier. The average price across every implemented instrument has also climbed, from just above $10 a ton in 2015 to roughly $19 a ton in 2025.

That average still falls well short of the $60-to-$127-a-ton range that the High-Level Commission on Carbon Prices, adjusted for inflation, considers consistent with the Paris Agreement's temperature goal. Coverage has expanded steadily since Finland introduced the world's first carbon tax in 1990. The price level attached to that coverage has grown far more slowly, and carbon pricing raised more than $100 billion in public revenue for the second year running in 2024, though the total came in below 2023's record because prices eased in two of the largest trading systems, the EU and the UK. Over half of that revenue was earmarked for environmental, infrastructure, or development spending, a slightly larger share than in prior years.

From $170 in Norway to 11 Cents in Poland

A global average obscures how differently individual governments have set their own prices. Tax Foundation Europe's April 2026 survey found that Norway now levies the highest explicit carbon tax rate in Europe, at €146.23 ($169.71) a ton, ahead of Sweden at €133.17 ($154.55) and Switzerland and Liechtenstein, both at €129.09 ($149.81). Poland's rate sits at €0.09 ($0.11) a ton, close enough to zero that it functions as a legal placeholder rather than a price signal.

The European Union's emissions trading system prices carbon differently, through an auction market rather than a statute, and the two mechanisms increasingly interact. The European Commission's first official price for its Carbon Border Adjustment Mechanism came in at €75.36 a ton for imports in the first quarter of 2026, calculated directly from that quarter's EU ETS auction prices, with the second quarter settling at €75.28.

None of these figures map cleanly onto what a Pigouvian tax is supposed to charge: the actual damage a ton of carbon dioxide does to the climate system. The US Environmental Protection Agency's 2023 estimate of that damage, known as the social cost of carbon, put the figure at $190 a ton in 2020 dollars using a 2 percent discount rate, higher than the highest tax rate charged anywhere in Europe. Earlier US estimates ranged from $43 a ton under the Obama-era Interagency Working Group down to $3 to $5 a ton when an administration restricted the calculation to domestic damages and applied a higher discount rate. That sensitivity to discount rate and geographic scope is a genuine limitation of the method: the "right" Pigouvian price for carbon is a disputed range among economists, not a settled number, and every existing tax rate is a political compromise somewhere inside or below it.

Where a Carbon Tax's Revenue Goes Shapes How Long It Lasts

A tax and a trading system can charge similar prices and still behave very differently once the money arrives. Sweden deposits its carbon tax revenue into the general budget with no earmarking at all, a design its own government describes as deliberate, keeping spending decisions separate from the rationale for the charge. The EU took the opposite path: since 2023, member states have been required to spend 100 percent of their emissions trading system auction revenue on climate and energy measures, up from 50 percent before the rule changed.

Neither design is obviously more efficient, since a dollar of carbon tax revenue is fungible with any other government dollar once it reaches a treasury. The difference is political. Earmarking gives a visible answer to where the money went, which can blunt opposition to the charge itself; a general-fund carbon tax has to rely on trust in the wider budget process instead.

Canada's Repeal Shows Which Half of a Carbon Price Survives Politics

Canada offers the clearest recent test of that calculus. The country's federal carbon-pricing system had two parts: a consumer-facing fuel charge, paid directly by households at the pump and in home heating bills, and an industrial pricing system for large emitters. On his first day as prime minister in March 2025, Mark Carney ended the consumer fuel charge by regulation, effective April 1, and the government has since moved to repeal the underlying law rather than leave it dormant. The industrial system stayed in place.

The repeal targeted the part of the policy voters felt every time they filled a tank, not the part doing most of the work. A 2024 analysis by the Canadian Climate Institute, cited in reporting on the repeal, found that industrial carbon pricing accounted for roughly 80 percent of the emissions reductions attributed to Canada's carbon pricing system overall. The research group I4CE noted separately that most of the fuel charge's revenue had been returned directly to households through rebates, which by design should have limited its net cost to most families even as it kept a price signal in place.

Put together, the two facts point to an asymmetry that Pigouvian tax theory does not fully anticipate: the segment of a carbon price a person can see on a receipt is the most exposed to repeal, even though it is not the segment producing the largest share of the emissions cuts. A charge folded into an industrial compliance system or wholesale energy prices appears more durable partly because nobody experiences it as a line item.

One repeal is not proof of a universal rule, but it lines up with the pattern in the price data above. Sweden's carbon tax started at SEK 250 a ton in 1991 and reached its current level through three decades of gradual, scheduled increases on fuel suppliers rather than a single new charge announced to households at once, a design its government credits with making the later increases politically durable. Norway and Switzerland followed a similar gradual path. The carbon prices that have grown the largest are, so far, the ones nobody had to notice arriving.