Kiera Jefferson
Pollution is the leading cause of death for humans, with air pollution alone causing 8.1 million deaths worldwide in 2021. It is a silent killer, often not cited as a cause of death, but it kills around 500 times more people annually than natural disasters. The major outdoor pollution sources include residential energy for cooking and heating, vehicles, power generation, agriculture/waste incineration, and industry. As global warming and climate change worsen, the impact of pollution on human health will also increase, with chronic pollution and heat exacerbating health stressors. While pollution is a significant threat, it is not inevitable. Political will and action have successfully reduced pollution in the past, and similar efforts can be made again. Additionally, global population growth slowing down and the implementation of clean technologies can contribute to a significant decrease in pollution-related deaths.
| Characteristics | Values |
|---|---|
| Number of deaths from air pollution in 2021 | 8.1 million |
| Leading cause of death for | Children under five years |
| Largest cause of death from pollution | Low-income and middle-income countries |
| Cause of death | Heart disease, stroke, lung cancer, acute and chronic respiratory diseases, diabetes |
| Lead poisoning and chemical pollution cause | 1.8 million deaths |
| Global population expected to peak at | 10-11 billion |
| Possible causes of extinction | Climate change, disease, nuclear war, meteorite impact |
| Clean technologies can | Reduce pollution deaths |
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What You'll Learn
- Pollution is the leading cause of death, killing 9 million annually
- Air pollution is the second leading risk factor for death, causing 8.1 million deaths in 2021
- Lead poisoning and chemical pollution cause 1.8 million deaths
- Climate change, disease, war, and asteroids are other human extinction causes
- Political will and clean technologies are positive steps to reduce pollution
Pollution is the leading cause of death, killing 9 million annually
Water pollution is responsible for 1.4 million premature deaths annually, while lead poisoning causes around 900,000 deaths. Additionally, toxic occupational hazards, excluding workplace fatalities, contribute to 870,000 deaths. The total impact of pollution on health is likely even higher, as more comprehensive health data and analysis of chemical pathways are needed.
The impact of pollution is disproportionately felt in low- and middle-income countries, which suffer from the highest exposures and bear the greatest burden of economic losses. However, it is important to note that pollution does not discriminate solely based on income levels. For example, in the UK, the Great Smog of London in 1952 caused the deaths of 4,000 people, leading to the implementation of the Clean Air Act in 1956.
Since then, the UK has seen significant reductions in local air pollutants, with emissions being just a fraction of what they once were. Similar success stories can be found in the US, Canada, France, and Germany, where environmental regulations and initiatives have led to substantial decreases in overall emissions and air pollutants. These improvements give hope that we are approaching "peak pollution deaths" and that the worst may be behind us.
However, despite these positive developments, pollution remains a critical issue. The continued rise in global population and the associated demands on resources and energy will require careful management to ensure a sustainable future. Additionally, the effects of pollution on the planet's ecosystems and climate change cannot be overlooked, as they present further risks to human health and habitation.
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Air pollution is the second leading risk factor for death, causing 8.1 million deaths in 2021
Air pollution is a major threat to human health and the environment. In 2021, it was the second leading risk factor for death, causing 8.1 million deaths worldwide, according to the State of Global Air (SoGA) report. This report, a collaboration between the Health Effects Institute (HEI) and the Institute for Health Metrics and Evaluation's Global Burden of Disease project, provides valuable insights into the severe health impacts of air pollution.
The report reveals that nearly every person on Earth breathes air that contains unhealthy levels of pollutants daily. Outdoor fine particulate matter (PM2.5), household air pollution, ozone (O3), and nitrogen dioxide (NO2) are among the pollutants with the most significant health consequences. These tiny particles, measuring less than 2.5 micrometres in diameter, can infiltrate the lungs and even enter the bloodstream, increasing the risk of various diseases.
The impact of air pollution on children is particularly concerning. In 2021, over 700,000 deaths in children under five were linked to air pollution, making it the second-leading risk factor for death in this age group. Children are more vulnerable to air pollution as they inhale more air per kilogram of body weight and absorb more pollutants relative to adults. Additionally, the damage caused by air pollution can start in the womb and have lifelong health effects, such as premature birth, low birth weight, asthma, and lung diseases.
While the number of deaths from air pollution is alarmingly high, there is some reason for optimism. Death rates from indoor and outdoor air pollution are declining, even in the most polluted countries. For instance, emissions of local air pollutants in the UK are just a fraction of what they once were. Nitrous oxides are down 76% from their peak, black carbon is down 94%, volatile organic compounds have decreased by 73%carbon monoxide emissions have been reduced by 90%.
To address air pollution and mitigate its health risks, various interventions and policies have been proposed. These include initiatives to raise awareness about the risks of air pollution and promote cleaner technologies and sustainable land use. By implementing such measures, we can reduce ambient air pollution from residential energy, vehicles, power generation, agriculture, waste incineration, and industry. Additionally, policies that address greenhouse gas emissions and climate change can have co-benefits for both the environment and human health.
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Lead poisoning and chemical pollution cause 1.8 million deaths
While it is challenging to predict when humans will die from pollution, the current rate of pollution-related deaths is alarming. According to a report by The Lancet Commission on Pollution and Health, pollution is responsible for approximately 9 million deaths annually, making it deadlier than war, terrorism, malaria, HIV, drugs, or alcohol. This equates to about one in six deaths worldwide being linked to pollution.
Among the various types of pollution, lead poisoning stands out as a significant contributor to mortality. Lead exposure was attributed to an estimated 1.5 million deaths globally in 2021, primarily due to cardiovascular effects. Lead is a naturally occurring toxic metal found in the Earth's crust, and its widespread use has led to extensive environmental contamination and significant public health issues. Lead poisoning, also known as plumbism or saturnism, can cause severe damage to the brain and central nervous system, resulting in coma, convulsions, and even death. Children are especially vulnerable to lead exposure, and those who survive severe lead poisoning may be left with permanent intellectual disabilities and behavioural disorders.
The presence of lead in the human body can occur through contaminated air, water, dust, food, or consumer products. Atmospheric lead pollution increased significantly in the 1950s due to the widespread use of leaded gasoline. Lead is still widely used today, primarily in the manufacture of lead-acid batteries for motor vehicles. Other products containing lead include pigments, paints, solder, stained glass, lead crystal glassware, ammunition, ceramic glazes, jewellery, toys, and traditional cosmetics.
In addition to lead poisoning, chemical pollution as a whole is responsible for a growing number of deaths. Hazardous chemical pollutants caused approximately 1.8 million deaths in 2019, up from 900,000 in 2000. This increase is attributed to the growing use of industrial chemicals and fossil fuels, particularly in developing economies. While policies and interventions to reduce air and water pollution have been implemented, the increasing use of certain chemicals in household items and the difficulty of protecting against pollution-related health hazards contribute to the rising death toll.
The impact of pollution is not limited to mortality but also includes economic losses. In 2019, excess deaths due to pollution resulted in economic losses totaling $4.6 trillion, equivalent to 6.2% of global economic output. Furthermore, low- and middle-income countries bear the brunt of pollution-related deaths and economic losses. Lasting prevention of pollution and pollution-related diseases will likely require government-supported interventions at a societal scale, encouraging a swift transition to clean and renewable energy sources.
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Climate change, disease, war, and asteroids are other human extinction causes
While pollution is a significant concern, there are other factors that could contribute to human extinction. Climate change, for instance, poses a serious threat. However, climate scientists generally agree that the risk of human extinction specifically due to climate change is very low. Nevertheless, climate change can cause severe disruptions to our way of life, and urgent action is needed to mitigate its worst consequences.
Disease has been a significant driver of population dynamics throughout history. Infectious diseases, in particular, can lead to population decline and, in some cases, extinction. Sexually transmitted infections are of specific concern, as they often affect fecundity rather than mortality, allowing infected individuals to remain in the population and spread the disease over an extended period.
War, particularly nuclear war, is another potential cause for human extinction. The use of nuclear weapons could result in catastrophic loss of life and render many areas of the planet uninhabitable. The likelihood of nuclear war is a subject of debate, with estimates ranging from 0% to 80% for the 21st century.
Finally, asteroid impacts pose a significant risk of human extinction. A large enough asteroid impact could transform Earth into an inhospitable planet. While the probability of a giant asteroid impact in the next billion years is estimated to be between 0.03 and 0.3, the threat of long-period comets with very short warning times cannot be overlooked.
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Political will and clean technologies are positive steps to reduce pollution
While it is challenging to predict an exact timeline for when humans will die from pollution, it is clear that the current rate of pollution poses significant risks to human health and the environment. Political will and clean technologies play a crucial role in mitigating these risks and fostering a more sustainable future.
Political will refers to the commitment and efforts made by governments and policymakers to address pollution and its impacts. One notable example is the Clean Air Act, implemented in the UK in 1956 and in the US soon after, which successfully reduced the visible smogs in cities like London. Similar legislation in the USA has led to a significant decrease in overall emissions of air pollutants over the years. The US 1990 Oil Pollution Act and the 1987 Montreal Protocol are other examples of political interventions that have positively impacted the environment. The Montreal Protocol, for instance, has eliminated almost all CFCs from industrial and consumer products worldwide. These examples demonstrate how political will can drive meaningful change and reduce pollution through legislation, regulations, and international agreements.
Clean technologies, on the other hand, offer innovative solutions to mitigate environmental harm. This includes advancements in waste management, such as state-of-the-art recycling and waste-to-energy technologies that reduce landfill waste. The automotive industry is also undergoing a transformation with the development of sustainable fuels and electric cars, leading to lower carbon emissions. Additionally, there has been significant progress in the building industry with the adoption of green building techniques, intelligent systems, and energy-efficient materials. These technologies not only reduce pollution but also contribute to cost reduction, improved operational performance, and enhanced productivity.
The private sector has also embraced clean technology, recognizing its potential to reduce pollutants and dirty fuels. Companies are integrating clean technology into their Corporate Social Responsibility (CSR) goals, with Fortune Global 500 firms investing billions of dollars in CSR activities related to sustainability. Between 1997 and 2021, there was a significant increase in the number of patents for clean and sustainable technologies, reflecting the growing focus on innovation in this field. Regulatory schemes and international treaties, such as the Paris Agreement, have further encouraged investments in renewable sources and energy efficiency technologies.
The World Health Organization (WHO) has also played a pivotal role in addressing pollution. Through initiatives like the "Beat the Heat" campaign and digital outreach programs, WHO raises awareness about the risks of air pollution and promotes solutions. WHO provides technical support to member states, helping them develop normative guidance and policies to improve air quality and protect public health.
In conclusion, political will and clean technologies are indeed positive steps towards reducing pollution and mitigating its impacts. Through effective legislation, international cooperation, and innovative solutions, it is possible to create a more sustainable and healthy future for humanity. While challenges remain, the combination of political commitment and technological advancements offers a promising path forward in the fight against pollution.
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Frequently asked questions
Humans will likely not die from pollution. Unlike yeast, which can be poisoned by its own waste products, humans have the foresight and resources to avoid poisoning themselves to death.
Almost all of the global population (99%) breathe air that exceeds WHO guideline limits, with low- and middle-income countries suffering the most exposure. Air pollution is a major threat to health, causing strokes, heart disease, lung cancer, and acute and chronic respiratory diseases.
Major outdoor pollution sources include residential energy for cooking and heating, vehicles, power generation, agriculture/waste incineration, and industry.
Policies and investments that support sustainable land use, cleaner household energy and transport, energy-efficient housing, and better waste management can effectively reduce key sources of ambient air pollution.
Yes, there is reason for optimism. In many growing economies, air pollution is decreasing, and death rates from air pollution are falling even in the most polluted countries. Emissions of local air pollutants are just a fraction of what they were, with significant reductions in nitrous oxides, black carbon, volatile organic compounds, and carbon monoxide.
