Meghan Hodges
International trade has a significant impact on global pollution levels, with around 22% of global CO2 emissions resulting from the production of goods consumed in a different country. While some countries have reduced their domestic emissions in recent decades, this has been offset by increasing imports from countries with more carbon-intensive energy sources, such as China. This outsourcing of emissions provides a more complete picture of a country's environmental impact and has led to calls for a reevaluation of environmental responsibilities in global policy-making. International food trade, for example, has been found to cause water pollution and biodiversity loss in exporting countries, as well as crop conversion and N pollution in importing countries. The transportation sector also contributes greatly to pollution, particularly in the US, where it accounts for about 28% of total greenhouse gas emissions.
| Characteristics | Values |
|---|---|
| Global CO2 emissions from production that are consumed in a different country | 22% |
| US increase in domestic emissions since 1990 | 9% |
| US increase in consumption emissions since 1990 | 17% |
| UK decrease in domestic CO2 production emissions between 1990 and 2014 | 27% |
| UK decrease in consumption emissions between 1990 and 2014 | 11% |
| US decrease in imported carbon emissions since 2007 | Slight |
| China's decrease in CO2 exports from their peak in 2007 | 25% |
| India's increase in CO2 exports since 2007 | Yes |
| Net CO2 emissions embedded in trade | Net of CO2 imported or exported via traded goods |
| US damage avoided due to international trade in 2002 | 2.7% of the trade deficit and 3.4% of the value-added associated with trade |
| US sector with the largest contribution to GHG emissions | Transportation |
| Percentage of total US GHG emissions that the transportation sector contributes | 28% |
| Environmental impact of international food trade | Water pollution and biodiversity loss in exporting countries |
| Environmental impact of soybean trade | N pollution in importing countries |
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What You'll Learn
The environmental cost of exporting countries
The environmental costs of exporting countries are significant and multifaceted. Firstly, there is the direct impact of production processes on the environment in exporting countries. The manufacturing and production of goods for export can result in increased pollution, including carbon dioxide (CO2) emissions, contributing to global warming and climate change. For instance, China, the largest net exporter of CO2, has seen dramatic increases in emissions since 1990, although this is mainly due to domestic consumption.
Secondly, the expansion of international trade has led to a greater use of transportation services, which has environmental implications. The introduction of the jet engine and containerization in the second half of the 20th century significantly reduced transportation costs, increasing the range and volume of traded goods. This expansion of trade requires the transportation of goods from the country of production to the country of consumption, leading to increased use of fuel and subsequent emissions.
Thirdly, the process of "unbundling" production across global supply chains has environmental consequences. Technological innovations and open trade policies have enabled the manufacturing of parts and components in different locations worldwide. This fragmentation of production can increase the environmental impact as more countries become involved in the production process, and the final product may have a larger carbon footprint due to the energy used in transportation and coordination.
Lastly, the environmental cost of exporting countries is also influenced by the types of goods being exported. Trade liberalization can change a country's production mix towards products in which it has a comparative advantage. This can result in an increase in the production of goods with higher environmental impacts, such as energy-intensive or polluting industries. The scale effect of trade opening, which increases economic activity and energy use, can further exacerbate this issue, leading to higher levels of greenhouse gas emissions.
Overall, the environmental cost of exporting countries is complex and multifaceted, involving direct pollution from production processes, increased transportation emissions, the fragmentation of production across global supply chains, and the environmental impacts of specific export goods. Addressing these issues requires a comprehensive approach that considers the entire supply chain and promotes sustainable practices and technologies to mitigate the environmental impact of exporting countries.
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The impact of imported emissions on domestic emissions
According to research, around 22% of global CO2 emissions stem from producing goods that are ultimately consumed in another country. This means that a significant portion of a country's domestic emissions may be attributed to the production and import of goods from other nations. For example, while the UK's domestic CO2 emissions decreased by 27% between 1990 and 2014, this reduction is offset by imported emissions, resulting in only an 11% reduction when considering consumption emissions. Similarly, the US experienced a 9% increase in domestic emissions during the same period, which translates to a 17% increase when trade emissions are included.
The carbon intensity of imports also plays a crucial role in the impact of imported emissions on domestic emissions. Developed countries with lower per-capita emissions tend to have a higher proportion of their CO2 emissions from imports. Conversely, export-heavy countries like Brazil, Russia, India, and China (the BRIC countries) have higher carbon-intensive production processes. As a result, the carbon intensity of their exports is nearly double that of advanced economies. If the US replaced BRIC countries' exports with domestically produced goods or those from lower-carbon-intensity sources, global emissions would decrease significantly.
Additionally, the outsourcing of manufacturing to countries with more carbon-intensive energy mixes can also affect domestic emissions. For instance, while the US and many European countries have reduced their domestic emissions, some of these reductions have been offset by increasing imports from countries like China, which may have less efficient energy systems. This dynamic highlights the interconnectedness of global trade and emissions, underscoring the need for international cooperation and comprehensive emissions accounting.
In conclusion, the impact of imported emissions on domestic emissions is significant and often underestimated. To accurately assess a country's carbon footprint and work towards global emission reduction goals, it is essential to consider the emissions embedded in international trade and consumption patterns. Addressing the carbon intensity of imports and promoting cleaner production processes in exporting countries can lead to substantial emission savings and contribute to the global effort to mitigate climate change.
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The health and economic consequences of air pollutants in exports and imports
International trade has a significant impact on global air pollution levels, affecting the health and economies of nations. The production and transportation of goods for export and import can redistribute emissions and alter the total amount of global emissions.
A notable example of this is the impact of Chinese air pollution on the United States. As the US outsourced manufacturing to China, it experienced a reduction in domestic emissions but an increase in imported emissions. Chinese air pollution related to the production of exports contributes up to 24% of sulfate pollution over the western US. This has led to a decrease in air quality in certain regions of the US. Additionally, around 22% of global CO2 emissions stem from the production of goods that are consumed in a different country, with China being the largest net exporter of CO2. Traditional emissions inventories often do not include emissions associated with imported goods, leading to an incomplete picture of a country's environmental impact.
The impact of international trade on air pollution damages is not limited to the US. A study by Rajesh Sharma et al. (2023) examined the ecological footprint of diversified imports in BRICS countries (Brazil, Russia, India, China, and South Africa). While specific data on the health consequences of air pollutants in exports and imports was not readily available, it is evident that the environmental and economic impacts of these emissions have indirect effects on human health and well-being.
In conclusion, the health and economic consequences of air pollutants in exports and imports are complex and far-reaching. While trade may provide benefits to economies, it is important to consider the environmental and health impacts of associated emissions. Addressing these issues will require international collaboration and a comprehensive understanding of the global impacts of trade on air pollution.
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The carbon-intensive energy mix of imported goods
China is the largest net exporter of CO2, with its exports contributing significantly to the carbon footprint of countries like the US, Europe, and Japan. However, it's important to note that China's emissions are still predominantly driven by its domestic consumption. India is another country where CO2 emissions from exports are increasing. The expansion of the middle class in China and India has led to a rise in imports, which helps balance out their CO2 exports.
The argument has been made that emissions reductions in some countries are achieved by outsourcing manufacturing to carbon-intensive countries. This dynamic raises the question of responsibility for emissions: the exporting nation or the country consuming the goods? To address this, researchers track "consumption emissions" that account for imported CO2, providing a more complete picture of carbon transfers associated with the decline of manufacturing in developed nations.
To address carbon leakage and encourage cleaner industrial production, the EU has introduced the Carbon Border Adjustment Mechanism (CBAM). CBAM aims to ensure that the carbon price of imports is equivalent to that of domestic production. During the transitional phase, importers of goods within the scope of CBAM will report greenhouse gas emissions embedded in their imports and will need to buy and surrender certificates accordingly.
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The impact of international food trade on water pollution
International food trade has a significant impact on water pollution, and this impact is often negative. Firstly, it is important to note that around 22% of global CO2 emissions are a result of producing goods that will be consumed in a different country. This means that the environmental impact of a country's consumption is often outsourced to another country. For example, while the UK's domestic CO2 emissions fell by 27% between 1990 and 2014, once CO2 imports from trade are considered, this reduction drops to only 11%.
The environmental impact of international food trade is particularly evident in the case of soybean imports. Soybeans have a significant environmental impact on the importing countries, leading to a conversion of soybeans to N-demanding grains such as wheat, corn, and rice, which have high fertilizer demands and cause environmental pollution, especially water pollution. This is because N (nitrogen) is the most important nutrient for crop growth but can pollute soil, water, and air if used in excess.
In addition, the shift in focus of food security in Low- and Middle-Income Countries (LMICs) from producing staple foods to healthy diets stimulates the local production of fresh food such as fruit, vegetables, and fish, even in water-scarce regions. This can lead to the use of polluted water for food production, processing, and consumption, which might jeopardize human health. For example, fruits, vegetables, and fish are more prone to contamination through the use of polluted water, and the health effects of stimulating a healthier diet through such means are largely unknown.
Furthermore, 78% of global ocean and freshwater eutrophication is caused by agriculture. Eutrophication is the pollution of waterways with nutrient-rich water, which can have detrimental effects on aquatic ecosystems. While international food trade may not always directly cause water pollution, it can contribute to it through the increased use of transportation, packaging, and other associated activities. For instance, while most internationally traded food travels by boat, reducing the carbon emissions associated with transportation, the use of planes in some instances can emit 50 times more CO2eq than boats per tonne-kilometer.
Overall, the impact of international food trade on water pollution is complex and multifaceted. While it can lead to negative consequences such as increased water pollution and the use of polluted water in food production, it also has the potential to stimulate local food production and improve food security in LMICs.
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Frequently asked questions
A positive value indicates that a country or region is a net importer of CO2 emissions, whereas a negative value indicates that a country is a net exporter.
China is the largest net exporter of CO2 by far, with Russia in second place, exporting only a fifth as much.
The US is the largest net importer of CO2, importing around twice as much as Japan.
International trade has been shown to have a detrimental impact on the environment, particularly in exporting countries, causing water pollution, biodiversity loss, and deforestation.
While some countries have reduced their domestic emissions, this has been offset by increasing imports from countries with a more carbon-intensive energy mix, such as China. Therefore, including imported carbon emissions provides a more accurate picture of a country's carbon footprint.
