Global Cooperation

Explainer: Which countries have introduced a carbon tax?

Carbon tax is one method countries are using to help reduce pollution from fossil fuels.

Carbon tax is one method countries are using to help reduce pollution from fossil fuels. Image: Unsplash/Kouji Tsuru

Stefan Ellerbeck
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  • Carbon-pricing is regarded as one of the most powerful tools to help countries limit CO2 emissions and reach net-zero targets.
  • Denmark has approved a new corporate carbon tax which will become the highest in Europe.
  • Some of the world’s biggest emitters of CO2 have either not imposed a carbon tax or have introduced emissions trading systems instead.

In the race to net-zero more countries are looking at ways to reduce their CO2 emissions.

Carbon pricing is one option governments are using to help reduce pollution from fossil fuels and encourage investment in cleaner technology.

A carbon tax is levied on the carbon emissions required to produce goods and services. It generally only covers CO2 emissions, but can also apply to other greenhouse gases such as methane or nitrogen oxides - by taxing emissions based on their potential to contribute towards global warming.

According to the World Bank there are 68 direct carbon pricing instruments operating as of June 2022 in 46 national jurisdictions around the world. These comprise 36 carbon tax regimes and 32 emissions trading systems (ETS). These are tradable-permit systems which set a cap on the amount of greenhouse gases that can be emitted. Businesses and entities have the flexibility of buying and selling emissions units.


What are voluntary carbon markets?

20 largest carbon-emitting countries carbon tax carbon pricing
Most CO2 emissions from fossil fuels come from just 20 countries. Image:

What are the world’s biggest CO2 emitters doing about carbon pricing?

European Union

The Danish parliament has recently approved a new corporate carbon tax which is reported to become the highest in Europe. Denmark has already set an ambitious target of cutting greenhouse gas emissions by 70% from 1990 levels by 2030. The Danish government says it will target companies both in and outside the EU’s carbon quota system.

The EU ETS is the largest multi-sector ETS in the world. It includes 11,000 power stations and industrial plants across the EU and operates in all member states as well as the UK, Norway, Iceland and Liechtenstein. Under the “cap and trade” principle a maximum limit is placed on the right to emit certain pollutants and companies can trade emission allowances within the zone.


The world’s biggest emitter of CO2 launched the world’s largest carbon market in 2021 - three times the size of the European Union’s. China’s ETS is based on a cap-and-trade model initially involving coal- and gas-fired energy plants. It plans to soon add heavy industry and manufacturing to the scheme which would cover more emissions than the rest of the world’s carbon markets put together. China has a 2030 target for peak emissions and a goal of reaching net-zero emissions by 2060.

United States

Despite being one of the world’s biggest CO2 emitters, the US currently doesn’t have a carbon tax at a national level. But several states, including California, Oregon, Washington, Hawaii, Pennsylvania and Massachusetts, have introduced carbon pricing schemes that cover emissions within their territory. President Biden has pledged to cut emissions by 50% by 2030 and achieve net-zero by 2050. But the concept of a carbon tax is regarded by his administration as politically risky and difficult to get passed in the US Congress.


India contributes roughly 7% of the world’s CO2 emissions, making it the third highest in the world after China and the US. It does not tax carbon emissions directly but has placed a tax on both imported and domestically produced coal since 2010. Coal powers more than half of the country’s electricity generation.

Summary map of regional, national and subnational carbon tax initiatives.
Summary map of regional, national and subnational carbon tax initiatives. Image:

Carbon pricing is complicated

Other countries are considering introducing some form of carbon tax, but there are many reasons governments might be reluctant to do so. Instigating them can be politically difficult because some sectors of the business community and their allies may be opposed to them for financial reasons. Carbon taxes are also often regarded as being regressive as they can penalize poorer members of society by contributing to price rises. Another complicating factor is the issue of so-called “carbon-leakage” where businesses may try to move their operations to other countries with less stringent emissions policies. This could increase the countries’ total emissions.

It’s up to richer nations, which cause the most emissions, to lead by example, says OECD Secretary-General Mathias Cormann: “G20 economies are lifting their ambition and efforts, including through the explicit and implicit pricing of carbon emissions. However progress remains uneven across countries and sectors and is not well enough coordinated globally. We need a globally more coherent approach which enables countries to lift their ambition and effort to the level required to meet global net-zero by 2050”.

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