Helena Joyce
The world is facing a climate catastrophe as greenhouse gas emissions continue to rise, with the top 10 emitters increasing their emissions by 56.6% since 1990. The largest contributors to these emissions are China, the United States, and India, which together account for 42.6% of total emissions. Per capita emissions, however, paint a different picture, with the average American responsible for nearly twice as much climate pollution as the average person in China. Aside from countries, the most polluting industries include fossil fuels, livestock production, fashion, and construction. To avoid the worst impacts of climate change, urgent action is needed to reduce emissions to net zero by 2050, including the implementation of stringent climate policies and the adoption of sustainable practices.
| Characteristics | Values |
|---|---|
| Greenhouse gases | Responsible for global warming and climate destabilization |
| Top 3 GHG emitting countries | China, the United States, and India |
| Top 3 polluting countries per capita | Located in the Arabian Peninsula |
| Fossil fuels | The most polluting sector in the world |
| Livestock production | Biggest culprit in farm emissions, generating 4 billion tons of CO2eq in 2018 |
| Fashion industry | Produces about 10% of the annual carbon footprint |
| Transportation of merchandise | Accounts for 40% of emissions in the transportation sector |
| Construction | Estimated to emit about 40% of global emissions |
| Climate policy | Hungary is the EU country with the worst national and international climate policy |
| EU country with the highest CO2 emissions | Germany |
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What You'll Learn
Fossil fuels
The burning of fossil fuels releases large amounts of carbon dioxide, a greenhouse gas, into the air. Greenhouse gases trap heat in the atmosphere, causing global warming. The average global temperature has already increased by 1 degree Celsius, and global temperatures passed the critical 1.5-degree Celsius milestone for the first time in 2024. Warming above 1.5 degrees Celsius risks further sea level rise, extreme weather, biodiversity loss, species extinction, food scarcity, and worsening health and poverty for millions of people worldwide.
In addition to carbon dioxide, the burning of fossil fuels releases other harmful pollutants into the atmosphere. For example, a 2017 study found that 17.6 million Americans are exposed daily to toxic air pollution from active oil and gas wells, transport, and processing facilities. These pollutants include benzene, which is linked to childhood leukaemia and blood disorders, and formaldehyde, a cancer-causing chemical. Mining operations also generate toxic airborne particulate matter, and strip mining can release giant carbon stores held naturally in the wild.
The continued reliance on fossil fuels is impeding progress to limit climate change. Despite a brief decline during the COVID-19 pandemic, emissions from fossil fuels grew by 1% in 2022, reaching 40.5 gigatons of CO2. In 2023, carbon dioxide emissions from fossil fuels reached record levels, with a 1.1% increase compared to 2022 levels. To stabilize the climate, it is necessary to transition from fossil fuels to renewable energy sources such as solar and wind power.
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Livestock production
The livestock sector requires significant natural resources and has a significant impact on global warming. The primary greenhouse gases emitted by animal agriculture are methane and nitrous oxide. Methane is produced during the regular digestive process of ruminants such as cattle and sheep through enteric fermentation, with over 90% of enteric methane from cattle emitted through burping. Cattle (beef and milk) are responsible for about two-thirds of total livestock emissions, largely due to methane emissions from rumen fermentation. Manure management is also a significant source of methane and nitrous oxide emissions, with the storage of manure in liquid systems such as manure lagoons typically resulting in higher methane emissions.
Feed production for livestock also contributes to emissions, as the manufacturing of fertilizers and farm inputs emits carbon dioxide, and fertilizing crops generates nitrous oxide emissions. The application of manure as fertilizer for feed crops further increases nitrous oxide emissions. Intensive rotational grazing systems have been promoted as a way to reduce these emissions, by managing stocking densities and grazing duration to control nitrogen excreta distribution and vegetation regrowth.
In addition to these direct emissions, the energy used for animal production, ventilation, cooling, slaughtering, and processing also contributes to the climate impact of livestock production. The complex interactions within livestock production systems and the heterogeneity of the agricultural sector make it challenging to implement effective mitigation strategies. However, improved fertility in dairy cattle, for example, could lead to a reduction in methane emissions by 10-24% and reduced nitrous oxide by 9-17%. Overall, reducing livestock emissions is crucial to mitigate climate change and achieve global climate goals.
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Fashion industry
The fashion industry is the second-largest consumer industry of water, requiring about 700 gallons to produce one cotton shirt and 2,000 gallons of water to produce a pair of jeans. The industry uses 80 billion cubic meters of water annually, with this number projected to increase to 120 billion cubic meters by 2030. This high water consumption is extremely problematic for countries with already scarce water resources, such as Bangladesh, Cambodia, India, Pakistan, and Vietnam, where fashion production is often located.
Textile dyeing is the world's second-largest polluter of water, with 20% of global industrial water pollution caused by garment production. The dyeing and finishing processes use over 800 chemicals, which are absorbed into soils and washed into waterways, creating widespread negative effects due to their toxicity. In Vietnam, only 1% of wastewater treatment comes from the textile sector, with wastewater containing formaldehyde, chlorine, azo dyes, and other chemicals, which affect the health of people in surrounding areas.
The fashion industry is also a significant contributor to global carbon emissions, with fast fashion alone accounting for 10% of global carbon emissions. The use of synthetic fibres like polyester, nylon, and acrylic, which are derived from fossil fuels, increases carbon emissions and contributes to the proliferation of microplastics in the ocean, accounting for 35% of all microplastics. The fast fashion business model relies on overproduction and overconsumption, leading to high amounts of material waste, with garments often ending up in landfills or being incinerated.
The environmental impact of the fashion industry has led to calls for a shift towards slow fashion, with consumers reducing their consumption of fast fashion and supporting sustainable fashion brands. Governments also have a role to play in addressing the fashion industry's damaging effects, with initiatives such as the French president's pact with 150 brands to make the industry more sustainable.
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Construction
The construction sector is a significant contributor to climate change, with buildings and construction accounting for approximately 37% of global carbon emissions. This includes the extraction and transportation of building materials, construction processes, and the everyday operations of buildings. The production and use of materials such as cement, steel, and aluminum have a large carbon footprint, and the decarbonization of these sectors is challenging.
To address this issue, there is a pressing need to establish innovative cooperation models and implement strategies to decarbonize building materials. Three key strategies are to avoid unnecessary extraction and production, shift to regenerative materials, and improve the decarbonization of conventional materials. Builders and designers can also reduce the carbon footprint of new homes by targeting specific material categories, such as concrete, insulation, cladding, and interior surfaces.
The good news is that the construction sector has a unique opportunity to reduce tens of millions of tons of emissions and become a leading contributor to climate targets. The green transition in the building sector can unlock substantial opportunities, drive sustainable growth, and create healthier living conditions. For example, green buildings can improve air and water quality, foster community interaction, and enhance biodiversity.
To fully seize these opportunities, stakeholders across the value chain should adopt a strategic and collaborative approach, especially in standard setting, flagship development, policy design, and innovation. International action and collaboration are crucial to bringing together all stakeholders from across the entire lifecycle of the buildings sector to effectively address the challenge of reducing emissions.
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Country-level climate policies
China, the largest contributor to global emissions, has committed to ramping up renewable energy sources and reducing greenhouse gas emissions. Despite a heavy reliance on coal, China's emissions are projected to peak by 2025. The country's rapid development of renewable energy sources offers a glimmer of hope in mitigating its significant climate impact.
The United States, the second-largest emitter, has implemented the Inflation Act, integrating climate-focused measures into economic policies. This act promotes clean energy investments, tax credits for renewable projects, and initiatives for a low-carbon economy. Additionally, the US has seen a decline in planet-heating pollution in recent years.
India, the third-largest emitter, is investing in renewable energy sources and making significant efforts to reduce its greenhouse gas emissions. While its per capita emissions are below the global average, India's highly populated nature contributes to its overall ranking as a major polluter.
European Union countries, collectively responsible for a significant portion of emissions, are also taking action. While the EU has seen a decline in planet-heating pollution, individual countries like Germany, Hungary, Poland, and Romania have been criticized for their insufficient climate policies and counter-productive actions.
It is important to note that addressing climate change requires collective action and a multifaceted approach. Countries must not only reduce their carbon emissions but also offset their carbon footprint by supporting environmental initiatives globally. The Paris Agreement and the UN Climate Summit (COP28) are international efforts to address these pressing issues, but more urgent action is needed to prevent catastrophic consequences.
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Frequently asked questions
The worst climate polluting factors are human activities that emit greenhouse gases, such as the burning of fossil fuels, livestock farming, the fashion industry, and construction.
The countries that are the worst climate polluters per capita are located on the Arabian Peninsula due to their large share in the oil industry and small populations. The top three polluting countries in terms of total emissions are China, the United States, and India.
The fashion industry is the third most polluting industry, producing about 10% of our annual carbon footprint, more than all international flights and maritime shipping combined. It also consumes a significant amount of water and creates a lot of plastic waste.
To reduce the climate impact of the worst polluting factors, it is crucial to implement sustainable practices and reduce emissions. This includes shifting from fossil fuels to renewable energy sources, eating less meat, adopting regenerative agriculture practices, and using more sustainable materials and methods in construction.
