Greta Jimenez
Air pollution is the introduction of harmful substances into the Earth's atmosphere, which modifies its natural characteristics. The Earth's atmosphere is predominantly composed of nitrogen (71%) and oxygen (21%), with trace amounts of water vapour, argon, and carbon dioxide (1%). However, human activities have significantly altered the composition of the atmosphere, particularly through the release of greenhouse gases, such as carbon dioxide and methane, which trap heat and contribute to global warming. The combustion of fossil fuels, industrial facilities, motor vehicles, and agricultural practices are major sources of air pollution, leading to severe consequences for human health, biodiversity, and ecosystems. According to the World Health Organization (WHO), air pollution is responsible for approximately 7 million premature deaths annually, with 99% of people breathing air that exceeds the recommended guideline limits for pollutants.
| Characteristics | Values |
|---|---|
| Global atmospheric carbon dioxide levels | 315 ppm in 1958, higher than at any point in human history |
| Carbon dioxide increase since the 1960s | 2.6 ppm per year in the last decade (2015-2024) |
| Carbon dioxide increase rate compared to post-ice age | 100-200 times faster |
| Global temperature increase since the late 19th century | 0.3 to 0.6º C |
| Global temperature increase by 2100 | 4.5–7.2 degrees Fahrenheit (2.5–4 degrees Celsius) warmer than during the pre-industrial era |
| Sea level increase | 16-82 feet higher than in 1900 |
| Annual global deaths due to air pollution | 7 million |
| Percentage of global population breathing polluted air | 99% |
| Percentage of deaths attributed to outdoor air pollution in low- and middle-income countries | 90% |
| Global health costs due to poor air quality | $6 trillion annually |
| Global GDP reduction due to health impacts, lost productivity and reduced life expectancy | 5% |
| Global workdays lost annually | 1.2 billion |
| Global crop yield losses | 3-16% |
| Percentage of global air pollution from burning fossil fuels and biomass | 85% |
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What You'll Learn
Greenhouse gases and global warming
Greenhouse gases are atmospheric gases that trap the sun's heat, preventing it from escaping into space, and thereby warming the planet. This is known as the greenhouse effect, which is crucial for keeping the Earth's temperature warm enough to support life. The primary greenhouse gases include carbon dioxide, methane, nitrous oxide, and water vapour. Carbon dioxide, or CO2, is the most abundant greenhouse gas in Earth's atmosphere. It is released into the atmosphere through the burning of fossil fuels, solid waste, and the treatment of wastewater, among other industrial activities.
The concentration of carbon dioxide in the atmosphere has been increasing since the beginning of the industrial era, and current levels are unprecedented in the past 800,000 years. This is due to human activities, with transportation and electricity generation being the largest sources of carbon dioxide emissions. The increase in carbon dioxide and other greenhouse gases has led to a positive climate forcing, resulting in a warming effect on the planet. From 1990 to 2023, the total warming effect from greenhouse gases in the Earth's atmosphere increased by 51%, with carbon dioxide alone contributing a 42% increase.
Other greenhouse gases include methane, which is released during oil and gas drilling, and fluorinated gases, which are synthetic compounds used in refrigeration, air conditioning, and aerosol cans. Methane is a more potent greenhouse gas than carbon dioxide, absorbing much more solar energy, and it is a dangerous air pollutant. Fluorinated gases have a much higher global warming potential than CO2, even though they constitute a smaller volume of emissions.
The increase in greenhouse gases and the resulting global warming are causing significant changes to the planet's climate system. This includes rising sea levels, more extreme weather events, and the shrinking of habitats, such as the Arctic sea ice, which is endangering species like polar bears. The effects of global warming also impact human health, with rising temperatures leading to heat-related deaths and the increased transmission of infectious diseases.
To mitigate the impact of greenhouse gases and global warming, efforts are being made to reduce emissions and phase out certain practices. The EU, for example, is taking action to reduce its emissions of greenhouse gases and is working to phase out hydrofluorocarbons by 2050. Additionally, consumers and shareholders can push companies to clean up their supply chains and reduce their environmental impact.
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Fossil fuels and carbon emissions
Fossil fuels are formed from the decomposition of carbon-based organisms that died millions of years ago. They are non-renewable sources of energy, currently supplying around 80% of the world's energy. The three types of fossil fuels are coal, oil, and natural gas. Fossil fuels are burned to produce energy and are also used in the creation of plastics, steel, and a wide range of products.
The combustion of fossil fuels releases carbon dioxide, a greenhouse gas that is essential to Earth's natural greenhouse effect. This greenhouse effect keeps the average global surface temperature above freezing. However, the increased release of carbon dioxide into the atmosphere amplifies the greenhouse effect, causing global temperatures to rise. Carbon dioxide emitted from fossil fuels dissolves into the ocean, reacting with water molecules to produce carbonic acid and raising the ocean's acidity.
The Intergovernmental Panel on Climate Change (IPCC) has found that emissions from fossil fuels are the dominant cause of global warming. In 2018, 89% of global carbon dioxide emissions came from fossil fuels and industry. Coal is the dirtiest fossil fuel, responsible for over 0.3 degrees Celsius of the 1-degree increase in global average temperatures. Oil releases a significant amount of carbon when burned, contributing approximately a third of the world's total carbon emissions. Natural gas, while promoted as a cleaner energy source, is still a fossil fuel that accounts for a fifth of global carbon emissions.
Carbon dioxide emissions from fossil fuels reached record levels in 2023, impeding progress toward limiting global warming. The concentration of carbon dioxide in the atmosphere has increased from approximately 278 parts per million in 1750, at the beginning of the industrial era, to 420 parts per million in 2023. The rise in carbon dioxide and other greenhouse gas emissions is the primary driver of the planet's soaring temperatures.
To address the issue of carbon emissions from fossil fuels, a transition to renewable energy sources is necessary. The Paris Agreement, signed by world governments in 2015, demonstrates a commitment to reducing carbon emissions. However, current trends indicate that more urgent action is required to meet the agreed-upon targets.
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Air pollution and health
Air pollution is a pressing issue that poses significant risks to human health and well-being. It refers to the release of harmful pollutants into the Earth's atmosphere, which can have detrimental consequences for people and the planet. According to the World Health Organization (WHO), indoor and outdoor air pollution claims the lives of approximately seven million people worldwide each year. Alarmingly, 99% of people currently breathe air that exceeds the WHO's recommended guideline limits for pollutants, with those in low- and middle-income countries suffering the most.
The combustion of fossil fuels and biomass is the primary source of air pollution globally, contributing to the emission of short-lived climate pollutants such as black carbon, methane, and ground-level ozone, as well as being the main source of CO2 emissions. Power plants, motor vehicles, factories, equipment, and wildfires are among the direct sources of particle pollution, which includes fine particles and other pollutants such as nitrogen oxides (NOx) and sulfur oxides (SOx). These fine particles can penetrate deep into the lungs and even enter the bloodstream, leading to serious health issues.
Ozone, a powerful lung irritant, poses a severe threat to respiratory health. Exposure to ozone can cause inflammation and damage to the delicate lining of the small airways, impacting multiple body systems. High ozone levels induce breathing difficulties, including chest tightness, coughing, and shortness of breath, even within hours of exposure. Vulnerable groups, such as children, pregnant women, older adults, and individuals with pre-existing heart and lung conditions, are at an elevated risk of adverse health effects from air pollution.
The impact of air pollution on an individual's health is influenced by various factors, including exposure duration, concentration levels, and underlying health status. Proximity to industrial pollution sources, poor nutrition, stress, and underlying health problems can further exacerbate the health consequences of air pollution. Additionally, socioeconomic factors play a role, with people in low-income neighbourhoods and communities being more vulnerable to the detrimental effects of air pollution.
Addressing air pollution is crucial not only for safeguarding public health but also for promoting sustainable development. The costs of air pollution to society and economies, particularly in low- and middle-income countries, are substantial. Therefore, urgent action is required from government leaders, businesses, and citizens worldwide to reduce air pollution and mitigate its adverse health and environmental impacts.
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Climate change and rising sea levels
Climate change is causing global sea levels to rise due to two primary factors: melting ice sheets and glaciers, and the expansion of seawater as it warms. The warming of seawater is caused by the greenhouse effect, which is in turn caused by the presence of greenhouse gases in the atmosphere. Carbon dioxide is the most important long-lived greenhouse gas, and it is produced by the burning of fossil fuels. The more carbon dioxide there is in the atmosphere, the more the Earth's natural greenhouse effect is amplified, causing temperatures to rise.
Since 1880, the global mean sea level has risen by about 8–9 inches (21–24 centimeters). The rate of sea level rise has accelerated in recent years, rising by 0.14 inches (3.6 millimeters) per year from 2006 to 2015, 2.5 times the average rate of the twentieth century. By 2050, global mean sea levels are projected to rise by almost 1 foot (0.28 meters) above 2000 levels, and by over 3 feet (1 meter) by 2100. However, these projections are based on future rates of greenhouse gas emissions, and if emissions are not reduced, sea levels could rise by as much as 6.6 feet (2 meters) by the end of the century.
The effects of rising sea levels are already being felt in many parts of the world. In urban settings along coastlines, rising seas threaten infrastructure such as roads, bridges, subways, water supplies, and power plants. Higher sea levels also mean that storm surges push farther inland, and more frequent high-tide flooding occurs. In the United States, about 30% of the population lives in coastal areas, where rising sea levels are causing increased flooding, shoreline erosion, and hazards from storms.
The impact of rising sea levels is not uniform around the globe. Local factors such as ground settling, upstream flood control, erosion, and regional ocean currents can cause sea level rise to be higher or lower than the global average in specific locations. For example, in the Gulf of Mexico, the rate of sea level rise is higher than in other parts of the United States. Additionally, the shape of the Earth and the effects of gravity cause variations in sea level around the globe.
The effects of climate change are not limited to rising sea levels. Global warming is also causing more severe storms, droughts in some regions, and flooding in others. The change in average temperatures is shrinking habitats and endangering species such as polar bears, which are forced to travel farther to find food as their hunting grounds disappear. Climate change is also causing the expansion of ocean waters, which threatens to submerge low-lying islands and coastal areas.
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Natural disasters and volcanic activity
Volcanoes emit a variety of gases, including sulfur dioxide (SO2), carbon dioxide (CO2), and other volcanic gases and aerosols. These emissions have significant impacts on the Earth's atmosphere and climate. During major explosive eruptions, huge amounts of volcanic gas, aerosol droplets, and ash are injected into the stratosphere. While the injected ash falls rapidly from the stratosphere and has a relatively minor impact on climate change, volcanic gases can have a more lasting and significant effect.
Sulfur dioxide, for example, can react with other atmospheric gases and aerosols to form sulfuric acid (H2SO4). This conversion process has a notable impact on climate change. The resulting sulfuric acid condenses rapidly in the stratosphere to form fine sulfate aerosols, which increase the reflection of radiation from the Sun back into space, leading to a cooling effect on the Earth's lower atmosphere or troposphere. This cooling effect has been observed following significant volcanic eruptions, such as the 1982 eruption of El Chichon in Mexico, which expelled a massive plume that extended up to 27 km high and had a diameter of 100 km. The Northern Hemisphere experienced a cooling of 0.4-0.6°C, while the stratosphere saw a more significant temperature decrease of 4°C.
Volcanoes also release carbon dioxide, a potent greenhouse gas. While human activities, such as burning fossil fuels, contribute far more CO2 to the atmosphere annually, volcanic eruptions can still inject significant amounts of this gas into the atmosphere in a short period. For example, the 1980 eruption of Mount St. Helens released approximately 10 million tons of CO2 in just 9 hours. This eruption resulted in an international pollution event, with ash and sulfur dioxide spreading across the United States and eventually reaching around the world.
Volcanic pollution, while not as prevalent as anthropogenic pollution, cannot be ignored due to its potential impact on the atmosphere and climate. On average, between 50 and 60 volcanoes erupt each year, and even less frequent supervolcano eruptions do not contribute enough to equal or surpass anthropogenic pollution levels. However, volcanic eruptions can have immediate and significant impacts on the atmosphere and local ecosystems, affecting human and animal health, vegetation, and marine life.
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Frequently asked questions
It is difficult to provide a precise answer to this question as air pollution is a complex and ever-changing issue. However, according to the World Health Organization (WHO), 99% of people breathe air that exceeds the guideline limits for pollutants, with those in low- and middle-income countries suffering the most.
There are multiple sources of air pollution, including household combustion devices, motor vehicles, industrial facilities, power plants, and forest fires. The burning of fossil fuels and biomass is the largest contributor to global air pollution, accounting for 85% of all emissions.
Air pollution has severe health consequences, including respiratory diseases, asthma, strokes, heart attacks, cancer, and dementia. It is the largest environmental threat to human health worldwide, causing approximately 7 million premature deaths annually.
