Kiera Jefferson
Global pollution is a critical issue that poses significant risks to both human health and the environment. It is estimated that the world emits over 35 billion tons of carbon dioxide (CO2) annually, with Asia being the largest emitter, accounting for around half of these emissions. The leading sources of CO2 emissions include the use of fossil fuels, non-renewable energy generation, and polluting human activities. In addition to atmospheric pollution, plastic pollution is a pressing issue, with approximately 1 to 2 million tons of plastic entering our oceans each year. Furthermore, indoor and outdoor air pollution contribute to one in ten deaths globally, with low- and middle-income countries bearing the brunt of these adverse health impacts. Inequality exacerbates the problem, as the richest 1% of the world's population is responsible for a significant portion of global emissions. Addressing pollution is not just a matter of environmental protection but also offers economic and social benefits, such as improved resource efficiency, poverty alleviation, and enhanced prosperity.
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What You'll Learn
CO2 emissions by region
CO2 emissions vary significantly by region, with many factors influencing the differences. Asia is the world's largest emitter of CO2, responsible for around half of global emissions. This is due in large part to China, which is the largest single emitter of CO2 in the world, producing more than 10 GtCO₂ per year. The second-largest regional emitter is North America, with the majority of emissions originating in the United States, which is the largest contributor to CO2 emissions historically. The US has emitted around 400 billion tonnes since 1751, almost 1.5 times more than China. Europe is the third-largest emitter, with the countries of the European Union contributing almost a fifth of all emissions.
In recent decades, there has been a notable shift in the distribution of emissions. In the first half of the 20th century, Europe and the US accounted for more than 90% of emissions, but this has decreased significantly, and they now account for less than one-third. This is partly due to the rapid economic growth of developing countries, particularly in the Asia-Pacific region, where emissions have almost tripled since the year 2000. The Middle East has also seen a dramatic rise in emissions, going from the lowest emitter in 1965 to the fourth-highest in 2023.
While the average emissions per person are relatively low in Asia due to its large population, they are extremely low in Africa, the smallest regional contributor relative to its population size. This is due to very low per capita emissions, both historically and in the present. Within Africa, the poorest countries, such as Chad, Niger, and the Central African Republic, have the lowest average emissions per person, at around 0.1 tonnes per year, 150 times lower than in the US, Australia, and Canada.
The distribution of emissions is not solely determined by region, as prosperity, policy, and technological choices also play a role. The richest 1% of people emit as much planet-heating pollution as two-thirds of humanity, and their carbon-hungry lifestyles and investments in polluting industries have severe consequences for global warming.
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Fossil fuels and land use
Fossil fuels are a major contributor to global pollution. Crude oil, or petroleum, is a liquid fossil fuel composed primarily of hydrocarbons (hydrogen and carbon compounds). Oil is typically found in underground reservoirs or sedimentary rock crevices and is extracted through drilling or strip mining. Petroleum products account for approximately 35% of US energy requirements, with the transportation industry being the largest consumer. The burning of oil, coal, and gas has increased the acidity of the oceans by 30% since the Industrial Revolution, impacting marine life.
Coal, a carbon-rich rock, is another significant source of pollution. It is extracted through underground mining or surface mining (strip mining), with the latter being responsible for two-thirds of US coal production. Coal-fired power plants generate 35% of harmful mercury emissions, two-thirds of sulfur dioxide emissions, and most soot in the US. Fossil fuel-powered vehicles, such as cars, trucks, and boats, release carbon monoxide and nitrogen oxide, contributing to smog and respiratory issues.
Land use practices, particularly deforestation, also play a role in pollution. Deforestation accounted for about 10% of all human-induced greenhouse gas emissions in 2018. Between 2000 and 2009, degraded land emitted up to 4.4 billion tonnes of carbon dioxide annually. Land degradation reduces the soil's capacity to store carbon, and when forests are cleared or burned, they release stored carbon. If land degradation continues at the current rate, nearly 70 gigatonnes more carbon will be emitted by 2050 due to land use change and soil degradation.
Prosperity and economic growth are significant drivers of pollution. High-income countries, such as the US, Australia, and Canada, have much higher per capita CO2 emissions than low-income countries. For example, the average American or Australian produces the same amount of emissions in under two days as someone in Mali or Niger does in a year. Additionally, the richest 1% of the world's population is responsible for 16% of global consumption emissions, exceeding emissions from all car and road transport.
To address pollution and climate change, governments should target the excessive emissions of the wealthy and invest in a transition to renewable energy sources. Prioritizing human and planetary well-being over endless profit and GDP growth is crucial.
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Carbon inequality
The world currently emits over 35 billion tonnes of carbon dioxide each year. While emissions growth has slowed in recent years, it has yet to reach its peak.
The average American or Australian produces the same amount of emissions in under two days as the average person in Mali or Niger does in an entire year. Similarly, the carbon footprint in some of the poorest countries in Sub-Saharan Africa, such as Chad, Niger, and the Central African Republic, is around 0.1 tonnes per year, which is 150 times lower than in the USA, Australia, and Canada.
To address carbon inequality and climate change, Oxfam proposes a 60% tax on the incomes of the richest 1%, which could cut emissions by more than the UK's total emissions and raise $6.4 trillion annually to fund the transition to renewable energy.
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Air pollution death rates
Air pollution is one of the world's most significant health and environmental issues, and it arises in two contexts: indoor (household) air pollution and outdoor air pollution. It is a health and environmental concern in every country, although the severity varies.
Pollutants of major public health concern include particulate matter, carbon monoxide, ozone, nitrogen dioxide, and sulfur dioxide. Outdoor and indoor air pollution cause respiratory and other diseases and are significant sources of morbidity and mortality. According to the World Health Organization (WHO), almost the entire global population (99%) breathes air that exceeds WHO guideline limits and contains high levels of pollutants, with low- and middle-income countries suffering the highest exposures.
Air pollution is one of the leading risk factors for death, especially in low-income countries. In recent years, it has contributed to one in ten deaths globally. The combined effects of ambient air pollution and household air pollution are associated with an estimated seven million premature deaths annually. Death rates from indoor air pollution have seen a significant decline, while improvements in outdoor pollution have been more modest.
The sources of air pollution are diverse and context-specific. Major outdoor pollution sources include residential energy for cooking and heating, vehicles, power generation, agriculture/waste incineration, and industry. Indoor pollution rates tend to be high in low-income countries due to a reliance on solid fuels for cooking, while outdoor air pollution tends to increase as countries industrialize and transition from low to middle incomes.
Despite the challenges, there is reason for optimism. In many growing economies, air pollution is decreasing, and data scientist Hannah Ritchie argues that we are approaching 'peak pollution deaths' globally. Additionally, the air quality today is cleaner than it has been for centuries. As global population growth slows and air pollution continues to improve, the world may soon pass the peak of air pollution deaths.
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Plastic waste management
The world emitted over 35 billion tonnes of CO2 in 2020, with Asia being responsible for around half of these emissions. The average American or Australian produces the same amount of emissions in under two days as the average person in Mali or Niger does in a year. The carbon footprint of the super-rich is also a significant contributor, with the richest 1% responsible for 16% of global consumption emissions in 2019.
To address the plastic crisis, it is essential to reduce plastic waste generation and improve waste management and disposal methods. The Basel Convention provides guidance on better managing plastic waste, and the OECD Global Plastic Outlook reports on the global plastic waste situation.
- Reduce plastic waste generation: This involves minimizing the use of plastic products and promoting reusable alternatives to single-use plastics.
- Improve waste collection and disposal systems: Ensuring that solid waste disposal services and regular waste collection are accessible to all can help prevent littering and inadequate disposal.
- Increase recycling rates: By investing in recycling technologies and infrastructure, more plastic waste can be recycled and reused, reducing the environmental impact of plastic production and disposal.
- Educate communities: Providing awareness about the proper use, disposal, and management of plastic products can help individuals make more sustainable choices and contribute to better waste management.
- International cooperation: Addressing the plastic crisis requires collaboration between countries, as outlined in the Basel Convention, to regulate the transboundary movement of hazardous wastes, including plastic waste.
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Frequently asked questions
The world emits over 35 billion tonnes of carbon dioxide (CO2) each year, with the largest part of these gases coming from the use of fossil fuels.
Asia is by far the largest emitter of CO2, accounting for around half of global emissions. China, India, and the United States are also leading emitters.
Air pollution is one of the leading risk factors for death and poor health across the world. It is responsible for one in ten deaths globally and contributes to the global disease burden by reducing the quality of life and number of years lived in poor health.
To reduce plastic pollution, waste management strategies must be improved. For carbon emissions, rich countries must transition away from fossil fuels and towards renewable energy sources.
