Helena Joyce
The world's most polluting industries are those that emit the most greenhouse gases and significantly contribute to the global carbon footprint. Energy production remains at the top of pollution rankings, with fossil fuel combustion for electricity and heat generation accounting for approximately 75% of global greenhouse gas emissions. The fashion industry is the third most polluting industry, producing about 10% of our annual carbon footprint. The construction industry is also a major contributor to global emissions, accounting for about 40% when considering the extraction and transportation of building materials, construction processes, and everyday operations. Other polluting industries include agriculture, transportation, and food packaging. To tackle climate change, it is crucial to identify and prioritize decarbonizing these sectors.
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What You'll Learn
Fossil fuels
The use of fossil fuels has resulted in significant climate, environmental, and health costs. Each stage of the fossil fuel supply chain, from extraction and transportation to refining and burning, generates negative externalities. For example, unearthing, processing, and moving underground oil, gas, and coal deposits take an enormous toll on our landscapes and ecosystems. The fossil fuel industry leases vast stretches of land for infrastructure such as wells, pipelines, and access roads, as well as facilities for waste storage and disposal. In the case of strip mining, entire swaths of terrain, including forests and mountaintops, are destroyed to expose underground coal or oil.
The combustion of fossil fuels for electricity and heat generation accounts for approximately 75% of global greenhouse gas emissions. Despite renewable energy growth, coal-fired power plants continue to operate in many countries, releasing harmful pollutants and carbon dioxide. Fossil fuel combustion is the largest source of energy for electricity, providing 38% of US energy needs. Forecasts suggest that the use of gas will become an even greater part of the US energy mix, threatening to exacerbate air and water pollution.
The development and refinement of processes like fracking have helped make the US the world's top producer and consumer of gas since 2009. Fracking involves blasting huge quantities of water mixed with chemicals and sand into a well to fracture rock and enable the escape of oil or gas. This controversial method of extraction creates environmental and health problems, including air and water pollution. Each fracking well uses between 1.5 million and 16 million gallons of water, and the resulting wastewater can be toxic, often containing substances like arsenic, lead, chlorine, and mercury that contaminate groundwater and drinking water.
To stabilize our climate, it is necessary to shift our energy sources from coal, oil, and gas to renewable power such as solar and wind. Leading businesses are taking steps to understand and manage their greenhouse gas emissions by preparing annual inventories and setting long-term targets to reduce emissions.
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Agriculture
Water Pollution
Agricultural pollution is a major cause of water quality issues. Fertilizer and pesticide runoff from farms contaminates rivers, streams, lakes, wetlands, estuaries, and groundwater. The National Water Quality Assessment in the US found that agricultural runoff is the leading cause of water quality issues in rivers and streams. Fertilizers, pesticides, and manure contain high levels of nutrients such as nitrogen and phosphorus, which can cause excessive growth of algae and deplete oxygen levels in water, creating "dead zones". Soil erosion, caused by intensive management or inefficient land cover, also contributes to water pollution as sediments are washed into water bodies.
Air Pollution
Soil Pollution
Agricultural practices can also lead to soil pollution and degradation. Nitrogen fertilizers, while increasing crop yields, can negatively affect soil health and pollute groundwater. When excess fertilizer is applied, the remaining nutrients accumulate in the soil or are lost as runoff, contaminating water sources. Common agricultural practices such as monocropping lead to soil erosion, causing an irreversible decline in soil fertility and having catastrophic impacts on the global food system and climate change.
Plastic Waste
The use of plastic in agriculture, such as plastic sheeting for greenhouses, plastic storage for animal feed, and plastic mulch, has led to the introduction of microplastics and macroplastics into farmed landscapes. A 2021 FAO study estimated that 10 million tons of plastic waste are produced in agriculture annually, with low collection rates globally.
To address these issues, there is a growing focus on regenerative agriculture, also known as carbon farming, which aims to produce food more sustainably while sequestering more carbon in the soil.
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Fashion
The fashion industry is a significant contributor to air, water, and land pollution. The production of clothing involves the use of harmful chemicals and particulate matter released during the production, dyeing, and finishing stages. Textile dyeing is the world's second-largest polluter of water, as the water left over from the dyeing process is often dumped into ditches, streams, or rivers. The industry also consumes enough water to meet the drinking needs of five million people every year. The fashion industry is the second-largest consumer industry of water, requiring about 700 gallons to produce one cotton shirt and 2,000 gallons to produce a pair of jeans.
Fast fashion thrives on short trends, low prices, and low quality, resulting in 92 million tonnes of textile waste generated every year, with 85% of it ending up in landfills. The fashion industry produces a colossal amount of clothing each year, with many pieces never even being sold or worn. Companies bulk-order large amounts from factories to lower the price per garment, but this results in far more clothing being produced than can be sold. In addition to the environmental impact, the fashion industry has also been criticised for human rights abuses and worker exploitation, with many people working in dangerous conditions.
To make fashion more sustainable, the industry needs to address how it designs, produces, and delivers clothing. The European Commission has presented a strategy to make textiles more durable, repairable, reusable, and recyclable, tackle fast fashion, and stimulate innovation within the sector. This includes new ecodesign requirements, clearer information, and a Digital Product Passport, with companies encouraged to minimise their carbon and environmental footprints.
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Transport
The transportation sector is taking steps to reduce its environmental impact. Initiatives like the Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) aim to decarbonize aviation, and the development of sustainable fuels like SAF is underway. Electric vehicles and alternative fuels are also helping to reduce emissions, with electric buses and trucks emerging as competitive alternatives to combustion engines.
Public transport, cycling, and walking are encouraged as they help remove cars from the road and reduce emissions. Limiting international travel, especially by plane, can also significantly reduce an individual's carbon footprint. Improving fuel efficiency and reducing fuel consumption can decrease dependence on foreign oil and save consumers money.
Postal delivery services and the transportation of goods are also major contributors to emissions. Online shopping deliveries and global supply chains have increased the demand for transportation services, resulting in higher emissions. Enhancing charging infrastructure and smart grid technology can support growing electric vehicle fleets and reduce pollution.
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Energy production
Coal is the most polluting energy source, producing 80% of power plant carbon emissions. It pollutes during every stage of the energy production process, from mining and transportation to storage and burning. The burning of coal leads to soot, smog, acid rain, global warming, and carbon emissions. It also generates waste, including sludge, toxic chemicals, and heat.
Nuclear energy is a significant source of renewable energy, but it is not entirely clean. Nuclear energy production results in radioactive, high-level waste. While the level of hazard of nuclear waste decreases over time, it must still be dealt with safely.
Solar and geothermal energy are clean sources of energy, but they are limited by geographical constraints. Solar energy requires direct sunlight to generate usable power, while geothermal energy can only be produced in certain areas with high temperatures beneath the Earth's crust.
The extraction and transportation of natural gas contribute to pollution through methane leakage and land disturbance, which harms ecosystems and contaminates water sources.
To reduce pollution from energy production, a transition from fossil fuels to renewable energy sources is necessary. Additionally, improving energy efficiency, adopting cleaner fuels, and implementing effective policies for electrification and carbon capture can help mitigate the environmental impact of energy production.
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Frequently asked questions
There are several industries that produce high levels of pollution. The energy industry, which includes electricity production, is a major contributor to air pollution, with fossil fuel combustion for electricity and heat generation accounting for approximately 75% of global greenhouse gas emissions.
Other polluting industries include agriculture, fashion, construction, and transportation.
Agriculture is responsible for up to 8.5% of global greenhouse gas emissions, with livestock production being the biggest culprit, generating 4 billion tons of CO2eq in 2018.
The fashion industry pollutes through the use of cheap materials, toxic dyes, and water consumption. It produces about 10% of our annual carbon footprint and generates millions of tons of plastic waste.
The construction industry contributes to air pollution, especially in urban areas, and is linked to the declining air quality in India.
The transportation industry is a major polluter, with road transport accounting for nearly 75% of transport emissions and 15% of global CO2 emissions.
