The Carbon Price Argument — Sweden, EU ETS, and California

Carbon Pricing: Two Mechanisms

Carbon pricing comes in two forms. A carbon tax sets a price per ton of CO2 and lets emissions adjust. A cap-and-trade system sets a quantity of allowable emissions and lets the price adjust. Both mechanisms produce the same economic effect in principle — they make emissions more expensive at the margin and provide incentive for abatement. The political-economy of choosing between them differs in ways that matter for what gets implemented where.

Sweden's Carbon Tax

Sweden introduced a carbon tax in 1991, initially at low levels. The tax has been gradually raised to over $130 per ton of CO2 by 2024 — the highest carbon price applied anywhere in the world. Coverage includes most fossil-fuel combustion outside the EU ETS sectors. Industries with international trade exposure receive substantial rebates to prevent leakage.

The Swedish experience is the cleanest empirical case for substantial carbon pricing. Emissions per capita have fallen substantially over the period the tax has been in force, and the economy has continued to grow at rates comparable to other developed countries. The tax has not produced the economic collapse that opponents predicted; nor has it produced the dramatic emissions reduction that proponents promised. The pattern is incremental and sustained, which is what well-designed climate policy looks like.

The EU Emissions Trading System

The EU ETS, launched in 2005, is the largest carbon market in the world. It covers approximately 40% of EU emissions, including power generation, industrial heat, intra-EU aviation, and (from 2024) maritime shipping. The allowance price has been volatile — collapsing below €5 per ton in 2013, climbing above €90 by 2022, settling around €70 in 2024.

The system's design has improved substantially over its three trading phases. The original allocation was too generous and allowed prices to collapse; subsequent reforms have tightened the cap and introduced a market stability reserve that buffers against price volatility. The 2024 inclusion of buildings and road transport in a parallel ETS2 system will substantially expand coverage from 2027.

The ETS has produced measurable emissions reductions in covered sectors. EU power-sector emissions have fallen by roughly 50% since the system's launch, partly driven by ETS pricing and partly by parallel renewable-energy subsidies. The mechanism has worked, even through the political-economy stresses of the 2008 financial crisis and the 2022 energy-price shock.

The California Program

California's cap-and-trade program, in force since 2013, covers about 80% of state emissions and is linked to Quebec's program. Prices have run roughly $30-40 per ton in recent years — well below Sweden or the EU, but well above any other US carbon market. The program is the largest in North America and serves as the empirical model for what a state-level US carbon market can do.

The program has produced emissions reductions in covered sectors broadly consistent with California's climate targets, though attribution to the carbon-pricing mechanism specifically is difficult because of overlapping renewable-portfolio standards and direct regulations. The political durability has been substantial — the program has survived multiple administration changes and several ballot challenges.

The Distributional Politics

Carbon pricing is regressive without recycling. Lower-income households spend a larger share of income on energy than higher- income households, so a flat carbon tax falls disproportionately on them. The successful carbon-pricing regimes have addressed this:

• Sweden recycles revenue through general government spending including substantial social transfers.
• British Columbia's carbon tax pairs with offsetting income-tax reductions, making the overall package roughly distributionally neutral.
• The Canadian federal carbon backstop rebates substantial revenue directly to households on a per-capita basis.
• The EU ETS includes a "Modernisation Fund" that channels revenue toward lower-income member states.

The political durability of carbon pricing depends substantially on whether the revenue recycling is visible to affected households. Programs that recycle invisibly through general budgets are more vulnerable to political challenge than programs that distribute visible rebates.

The US Federal Question

The US has not adopted federal carbon pricing despite multiple legislative attempts. The 2009 Waxman-Markey bill passed the House but died in the Senate. Various subsequent proposals — Whitehouse- Schatz, Coons-Cornyn — have not advanced. The political coalition for federal pricing has not coalesced.

The 2022 Inflation Reduction Act took a different approach, providing subsidies for clean technology rather than pricing fossil fuels. The mechanism is politically more durable but is more expensive per ton of emissions reduced and produces different distributional effects (concentrated benefits to specific industries rather than broad price signals).

What Carbon Pricing Cannot Do

Carbon pricing addresses the externality that emissions are not priced into market transactions. It does not address several related problems:

• Innovation incentives for high-cost abatement technologies that need specific R&D support.
• Distributional consequences for fossil-fuel-dependent regions that need place-based investment.
• International cooperation problems where the global pool of emissions requires coordinated action.
• Information failures where households and firms underinvest in abatement even when the carbon price makes it economical.

The mature policy mix in countries that have made the most progress combines carbon pricing with regulations, subsidies, R&D support, and place-based transition investment. None of the components is individually sufficient; the combination is what works.

Reading List

• William Nordhaus, The Climate Casino (2013)
• Adele Morris's Brookings carbon-pricing work
• Carbon Pricing Leadership Coalition reports (annual)
• Bård Harstad on international climate agreements
• RFF Carbon Pricing 101 working papers (multiple authors)
• BC Climate Action Plan (annual reports on the BC carbon tax)
• California Air Resources Board cap-and-trade analyses

The Comparative Lesson

The countries and sub-national jurisdictions that have implemented carbon pricing have produced measurable emission reductions in covered sectors. The countries that have not have not. This is not controversial as a matter of empirics. The political-economy question is why some jurisdictions can implement carbon pricing and others cannot, and the answer is mostly about distributional politics and revenue-recycling design rather than about the underlying economics. The places where pricing has been politically durable have addressed distribution explicitly. The places where it has failed have not.