Meghan Hodges
The world's most polluting industries are responsible for emitting large amounts of greenhouse gases and contributing significantly to the global carbon footprint. These industries include energy, transport, manufacturing, construction, fashion, and food retail. While energy is the most polluting industry, accounting for 15.83 billion tonnes of GHG emissions annually, transport and manufacturing & construction also contribute significantly, with 8.43 billion and 6.3 billion tonnes of emissions respectively. Other polluting sectors include agriculture and mining, with livestock farming and rare earth metal extraction causing environmental damage and contributing to greenhouse gas emissions. To tackle climate change, it is crucial to identify and prioritize the most polluting sectors for decarbonization and sustainable practices.
| Characteristics | Values |
|---|---|
| Most polluting industry | Energy/Fossil fuels |
| Second most polluting industry | Transport |
| Third most polluting industry | Manufacturing and construction |
| Most polluting power plant in the US | James H. Miller Jr. power plant in Quinton, Alabama |
| Most polluting sector | Food retail |
| Most polluting activities | Food and plastic waste |
| Most polluting activities in the food industry | Livestock production |
| Most water-polluting activities | Oil spills |
| Most polluting industry for water | Fashion |
| Most immediate threats | Air, water, and soil pollution |
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What You'll Learn
Fossil fuels
Burning fossil fuels releases nitrogen oxides into the atmosphere, contributing to the formation of smog and acid rain. Fossil fuels are also a major source of ammonia, which is another nitrogen compound that contributes to air pollution. In addition, the combustion of additives found in gasoline produces cancer-causing ultra-fine particles and aromatic hydrocarbons. Globally, fossil fuel pollution is responsible for one in five deaths, with 350,000 premature deaths in the US in 2018 attributed to fossil fuel-related pollution. The environmental and health impacts of fossil fuels disproportionately harm communities of color and low-income communities.
The extraction and transportation of fossil fuels can also lead to oil spills, which have devastating consequences for communities, wildlife, and the environment. Oil spills can destroy habitats, erode shorelines, and result in beach, park, and fishery closures. The 2010 BP Deepwater Horizon spill, the largest in history, released 134 million gallons of oil into the Gulf of Mexico, causing widespread damage and costing BP $65 billion in penalties and cleanup costs.
Furthermore, fossil fuels are closely linked to plastic pollution. Over 99% of plastics are made from fossil fuels, and the plastic industry produces significant greenhouse gas emissions, expected to surpass those of coal-fired power plants by 2030. The production and use of plastics contribute to water pollution, with 14 million tons of plastic waste ending up in the ocean each year, killing wildlife and polluting the food chain.
Finally, the fossil fuel industry requires vast amounts of land for infrastructure, such as wells, pipelines, and waste storage, disrupting landscapes and ecosystems. Drilling, fracking, and mining operations generate enormous volumes of wastewater, which can contaminate waterways and aquifers with pollutants linked to cancer, birth defects, and neurological damage.
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Agriculture
The environmental impact of agriculture extends beyond greenhouse gas emissions. It is a highly resource-intensive industry, with 70% of the world's freshwater used for farming. In addition, agriculture is a significant contributor to water pollution, with chemical additives from farming contaminating rivers, streams, and lakes. Pesticides and fertilisers, widely used in modern farming techniques, can also jeopardise the health of the wider ecosystem.
Deforestation and land-clearing practices associated with agriculture also have a detrimental impact on the environment. Livestock production processes cause widespread deforestation, and it is estimated that an additional 14.5% of global emissions come from land-use changes. This destruction of habitats and biodiversity further exacerbates the environmental damage caused by the agricultural industry.
To reduce the pollution associated with agriculture, a global shift towards a vegetarian or vegan diet is necessary. This would entail fewer cows emitting methane and less intensive farming of the land. Additionally, farmers can adopt more sustainable farming methods, such as regenerative agriculture or carbon farming, which sequesters more carbon in the soil. The integration of new technologies, such as precision agriculture, can also help to optimise the use of pesticides and fertilisers, minimising chemical pollution.
By implementing these changes, the agricultural industry can play a significant role in tackling the climate crisis and reducing its environmental footprint.
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Fashion
Textile dyeing and finishing, yarn preparation, and fibre production have the highest impacts on resource depletion due to their energy-intensive processes. The production of leather, for instance, requires large amounts of feed, land, water, and fossil fuels to raise livestock, while the tanning process is among the most toxic in the fashion supply chain because the chemicals used are not biodegradable and contaminate water sources.
The fashion industry emitted 10% of global greenhouse gas emissions in 2021, releasing 1.2 billion tonnes of carbon dioxide per year, more than the carbon emissions from the shipping and aviation industries combined. If it continues at the same pace, the industry’s greenhouse gas emissions are predicted to increase by more than 50% by the year 2030.
The fast fashion business model has been identified as a significant contributor to the climate crisis, responsible for as much as 10% of global carbon dioxide emissions. It has also been linked to the proliferation of microplastics and chemicals in waterways, and the increasing impact of climate change from anthropogenic greenhouse gas emissions. Over 60% of fabrics used in fast fashion are nylon and polyester, which are non-biodegradable and make 35% of microplastic pollution in oceans.
Waste occurs at every stage of the garment manufacturing process, harming wildlife, degrading land, and polluting soil and water. About 85% of all textiles go to landfills each year, and washing some types of clothes releases 500,000 tons of microfibres into the ocean annually, equivalent to 50 billion plastic bottles.
However, there is a growing awareness among fashion producers and consumers about the need for the industry to change. Several companies, including large volume retailers, are integrating sustainability principles into their business strategies. Examples include global clothing chain H&M's garment collection scheme and outdoor clothing company Patagonia's jackets made from recycled polyester bottles.
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Food waste
The environmental impact of food waste is extensive. When food is wasted, so are the natural resources and wildlife sacrificed to produce it. This includes land and water usage, social and environmental costs, and a loss of biodiversity. Food waste generates 8% of annual greenhouse gas emissions, accounting for one-third of all human-caused GHG emissions. It is responsible for more emissions than the entire transport sector, with food waste in the EU totalling 57 million tons per year, or 127 kg per inhabitant.
The production and transportation of food also contribute to pollution. Agriculture is responsible for enormous amounts of habitat loss, water use, and pollution, with 70% of the world's freshwater going into farming. Meat production is a significant driver of environmental degradation, with livestock farming releasing large amounts of methane and nitrous oxide, powerful greenhouse gases.
Reducing food waste is crucial for mitigating these issues. Programs that collect and redistribute leftover food from supermarkets and restaurants can help reduce emissions and food insecurity. France, for example, has introduced a law forbidding supermarkets from throwing away food, instead requiring them to donate leftovers to those in need. Preventing food waste can increase food security, foster productivity, and promote resource and energy conservation.
Overall, food waste is a significant contributor to pollution, and addressing this issue is essential for environmental sustainability and social welfare.
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Transport
The burning of fossil fuels, such as petrol and diesel, used to power cars, trucks, ships, trains, and airplanes, is a primary source of transport-related air pollution. The widespread use of petrol and diesel vehicles, particularly in urban and suburban areas, makes them a key target for emission reduction initiatives. Private cars and small passenger vehicles are among the largest sources of transport-related air pollution, emitting carbon dioxide (CO2), nitrogen oxides (NOx), and particulate matter (PM).
Heavy-duty vehicles, such as lorries and freight trucks, are essential for goods transportation but are also major polluters. These vehicles consume large amounts of diesel fuel, releasing high levels of NOx and PM. Shipping is another critical component of global trade that significantly contributes to air pollution, especially in port cities. Large ships run on heavy fuel oil, producing high emissions of sulfur oxides (SOx), NOx, and fine particulate matter.
However, initiatives are being implemented to address transport-related pollution. The International Maritime Organization (IMO) has introduced regulations to limit sulfur emissions, and new technologies like LNG-powered ships are gaining popularity. The US Environmental Protection Agency (EPA) also has various programs and standards in place to reduce emissions from vehicles, such as stringent emissions standards for passenger vehicles and limits on sulfur in gasoline.
Transitioning to electric vehicles, encouraging shared mobility, and improving fuel efficiency are vital steps to mitigate the impact of transport on air pollution.
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Frequently asked questions
Energy is currently the most polluting industry in the world, generating 15.83 billion tonnes of GHG emissions annually. The burning of fossil fuels accounts for about 34 billion tonnes of GHG emissions each year.
Greenhouse gas emissions from the energy industry come primarily from burning fossil fuels for electricity, heat, and transportation. Over 94% of the fuel used for transportation is petroleum-based, including gasoline and diesel.
The top 7 most polluting industries in 2025 are energy, transport, manufacturing & construction, fashion, food retail, agriculture and mining.
Livestock farming is a major contributor to environmental damage. Cows and other animals release large amounts of methane and nitrous oxide, both powerful greenhouse gases. In addition, 70% of the world's freshwater goes into farming.
Mining for rare earth metals often involves digging vast open pits, leading to ecosystem disruption and contamination of the environment. For every tonne of rare earth elements produced, approximately 2,000 tonnes of toxic waste are generated.
