Carbon emissions by country
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Global Carbon Emissions Trends by Country
Carbon emissions have increased steadily worldwide from 1990 to 2020, with the power industry being the largest contributor, accounting for about 35–39% of total emissions. Countries can be grouped based on their emission trends: some have not seen declines, some are on a plateau, some have passively declined, and others have proactively peaked. Developed countries are more likely to have proactively peaked, while developing countries often see passive declines or continued increases in emissions .
Carbon Emission Efficiency and Regional Differences
There are significant differences in carbon emission efficiency (CEE) among countries. Most countries, especially in Asia and Africa, have not reached high efficiency levels, while a few European countries like Switzerland, Luxembourg, Norway, Denmark, and the UK are at the forefront. Developed countries generally have much higher CEE than developing countries. The gap between them first narrows and then widens, reflecting the temporary improvements in developing countries as they industrialize Xiao2023Dong2025. Urbanization, foreign trade, and renewable energy use improve efficiency, while heavy industry and high electricity use can reduce it Xiao2023Dong2025.
Major Carbon Emitters and Their Drivers
The top carbon-emitting countries—China, the USA, India, Russia, Japan, Germany, South Korea, Canada, Mexico, and South Africa—are responsible for a large share of global emissions. In these countries, higher income per capita, population growth, energy use, and trade (exports and imports) are key drivers of emissions. However, technological innovation helps reduce emissions, supporting the Environmental Kuznets Curve (EKC) hypothesis, which suggests emissions rise with economic growth up to a point and then decline as economies mature and adopt cleaner technologies Thio2021Nguyen2021Xiao2023.
Consumption-Based Emissions and International Trade
In developed countries, consumption-based emissions (which include emissions from imported goods) have peaked in many cases, with domestic emissions declining due to improved technology and lower carbon intensity. However, emissions from imported goods, especially from medium- and low-income countries, are still rising. This highlights the importance of supporting cleaner production technologies globally, not just domestically .
Sub-National and Sectoral Emission Patterns
Recent high-resolution data show that within countries, emissions can vary greatly by region and sector. For example, 73% of global CO2 emissions in 2021 were estimated with sub-country information, revealing uneven distribution of emissions due to differences in energy use and economic structure across regions .
Emissions in Developing Countries and Future Projections
BRICS countries (Brazil, Russia, India, China, South Africa) account for nearly half of global emissions. Projections suggest that Russia, Brazil, and South Africa’s emissions will stabilize, while China’s emissions are expected to peak around 2029, and India’s emissions will continue to rise beyond 2030. Energy structure, industrial development, and urbanization are key factors influencing these trends .
Policy and Economic Factors Affecting Emissions
Economic growth, trade openness, and financial development are major drivers of emissions in developed economies. Foreign direct investment (FDI) and stock market capitalization have a weaker, often negative, effect on emissions. Economic policy uncertainty can also influence emissions, with short-term uncertainty sometimes reducing emissions but increasing them in the long run. Policies promoting clean energy, technological innovation, and international cooperation are crucial for reducing emissions Nguyen2021Anser2021Zhang2020.
Conclusion
Carbon emissions by country are shaped by economic development, industrial structure, technology, and policy choices. Developed countries are more likely to have peaked or reduced emissions, while developing countries continue to see increases. Improving carbon emission efficiency, supporting technological innovation, and fostering international cooperation are essential for global emission reduction efforts.
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