Katerina Swanson
Coal is a non-renewable fossil fuel formed from the remains of ancient organisms. It is a sedimentary rock that is black or brownish-black in colour and has a high carbon and hydrocarbon content. Coal is combustible and has been used as a source of fuel for thousands of years, with references to its use in the Roman Empire and the Aztec Empire. It is the largest source of energy for generating electricity globally and is considered one of the most important primary fossil fuels. However, the burning of coal releases carbon dioxide, a greenhouse gas that contributes to climate change.
| Characteristics | Values |
|---|---|
| Definition | Coal is a fossil fuel formed out of carbon. It is a combustible black or brownish-black sedimentary rock with a high amount of carbon and hydrocarbons. |
| Composition | Coal is composed of more than 50% by weight or 70% by volume of carbonaceous matter produced by the compaction and hardening of altered plant remains, namely peat deposits. |
| Appearance | Coal is usually brown or black and occurs in stratified sedimentary deposits. |
| Formation | Coal is formed from the remains of ancient organisms, specifically plants that lived hundreds of millions of years ago in swampy forests. The layers of dirt and rock that covered these plants over time subjected them to extreme heat and pressure, turning them into coal. |
| Age | Coal takes millions of years to form and is considered a non-renewable energy source. |
| Usage | Coal is used as a fuel for generating electricity, heating, and cooking. It is also used in industrial processes, such as the production of synthetic materials, tar, fertilizers, and plastics. |
| Environmental Impact | Burning coal releases carbon dioxide, a greenhouse gas that contributes to climate change. Coal mining can also emit methane and cause environmental damage. |
| Global Usage | Coal is the largest source of energy for generating electricity globally and the most abundant fossil fuel in the United States. |
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What You'll Learn
Coal is a fossil fuel formed from ancient plants
Fossil fuels are compound mixtures made of fossilised plant and animal remnants from millions of years ago. The creation of fossil fuels such as oil, natural gas, or coal is determined by the type of fossil, the amount of heat, and the amount of pressure. Coal is a fossil fuel formed from ancient plants. It is a solid carbon-rich material that is usually brown or black and most often occurs in stratified sedimentary deposits.
Coal is defined as having more than 50% by weight (or 70% by volume) of carbonaceous matter produced by the compaction and hardening of altered plant remains, namely peat deposits. Different varieties of coal arise due to differences in the kinds of plant material, the degree of coalification, and the range of impurities. Coal has a high amount of energy stored in it, which is released when burned.
The burning of coal releases carbon dioxide, a greenhouse gas that contributes to climate change. Coal-fired power plants were the single largest contributor to the growth in global CO2 emissions in 2018, accounting for 40% of total fossil fuel emissions and over a quarter of total emissions. Coal mining can also emit methane, another greenhouse gas. The extraction and burning of coal have significant negative impacts on the environment and human health, causing premature death and illness.
To address these issues, many countries have reduced or eliminated their use of coal power. Additionally, technologies exist to mitigate the adverse effects of burning coal for energy, such as cleaning the coal before it arrives at the power plant by crushing it into small chunks and washing it.
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Coal is a non-renewable energy source
The process of coal formation began about 300 million years ago during the Carboniferous period. Layers of dirt and rock covered the plants over millions of years, and the resulting pressure and heat turned them into coal. Coal is classified into four main types: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and the amount of heat energy it can produce. Anthracite contains the highest percentage of carbon, ranging from 86% to 97%, and has the highest heating value among all coal ranks. Bituminous coal, the most abundant type in the United States, contains 45% to 86% carbon. Subbituminous coal typically contains 35% to 45% carbon and has a lower heating value. Lignite, the youngest type of coal, contains 25% to 35% carbon and has the lowest energy content.
The extraction and burning of coal have significant environmental and health impacts. It is the largest anthropogenic source of carbon dioxide, contributing to climate change. Coal-fired power plants are major contributors to the increase in global CO2 emissions. Additionally, coal mining can release methane, another greenhouse gas. The combustion of coal releases harmful gases and particulates, endangering human health and the environment. Coal fires can be challenging to control and can cause subsidence and the release of dangerous combustion gases.
Coal has been used as a fuel source for thousands of years, with early references dating back to the Roman Empire and the Aztec Empire. It has played a significant role in metallurgy and engineering, including the development of the coal-burning steam engine. Today, coal is still widely used for electricity generation, accounting for about half of the electricity produced in the United States. However, due to its environmental and health impacts, many countries are transitioning away from coal power, aiming to reduce or eliminate its use to mitigate its effects on global warming and climate change.
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Coal mining and combustion are dangerous
Coal is a fossil fuel, a solid carbon-rich material that is usually brown or black. It is one of the most important primary fossil fuels and is mined commercially in over 50 countries.
Health Risks of Coal Mining
Coal mining has long been recognised as a dangerous occupation, with a long history of mining disasters. For example, in the US, 104,895 coal miners were killed in mine accidents since 1900, with 90% of these fatalities occurring in the first half of the 20th century. While safety measures and technology have improved, coal mining remains hazardous. Miners face risks such as breathing in toxic gases, dust, and fumes that can lead to lung diseases like silicosis, COPD, lung cancer, and "black lung" (pneumoconiosis). Inhaling coal dust can scar the lungs and cause breathing difficulties, eventually leading to suffocation or heart failure. Other dangers include gas explosions, roof collapses, rock falls, and vehicle collisions.
Environmental and Health Risks of Coal Combustion
The combustion of coal releases massive amounts of pollution, contributing to climate change and intensifying health issues. Coal-fired power plants emit carbon dioxide (CO2), a greenhouse gas. In 2020, burning coal emitted 14 billion tonnes of CO2, accounting for 40% of total fossil fuel emissions and over 25% of global greenhouse gas emissions. Coal mining can also release methane, another potent greenhouse gas.
In addition to greenhouse gases, coal combustion emits toxic and carcinogenic substances. These pollutants contribute to lung conditions like bronchitis, emphysema, asthma, and chronic obstructive pulmonary disease. They also impact heart health, increasing the risk of heart attacks, arrhythmias, and congestive heart failure. The fine particles released during coal burning can be easily inhaled, reaching deep into the lungs and entering the bloodstream. This can lead to chest pain, coughing, and breathing difficulties.
Furthermore, coal fires can be challenging to control and extinguish, particularly when burning underground. These fires can cause the ground to subside, release dangerous combustion gases, and even initiate surface wildfires.
In summary, coal mining and combustion present significant dangers to human health and the environment. The transition to clean energy sources is crucial to mitigating these risks and addressing climate change.
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Coal is the largest source of energy for electricity worldwide
Coal is a fossil fuel formed from the carbon of living plants and other plant material, or "peat deposits", over millions of years. It is a carbon-rich, solid material that is usually brown or black and is often found in sedimentary deposits.
Despite the push towards cleaner energy sources, coal remains the single largest source of energy for electricity worldwide. In 2024, fossil fuels accounted for nearly 60% of global electricity generation, with coal alone contributing 35%. This is a slight decrease from 2020, when coal generated 34% of global electricity. While renewable energy sources are expanding, the global energy mix still relies heavily on traditional sources.
In emerging markets and developing economies, coal remains the backbone of power systems. China, the world's largest energy consumer, generated nearly 60% of its electricity from coal in 2024. India's reliance on coal is even more pronounced, with coal providing close to three-quarters of all electricity produced. In 2020, China, India, the United States, and Japan were responsible for over three-quarters of the world's coal-fired electricity.
Several factors contribute to the continued use of coal. Firstly, there is a growing energy demand, driven by factors such as extreme weather events and economic interests. For example, in 2022, extreme heatwaves in India sharply increased electricity demand, which was primarily met by coal-fired generation. Secondly, some industrial processes, such as iron and steel production, still require coal's carbon content. Additionally, in certain regions like the European Union and the United Kingdom, coal has been used to enhance the security of electricity supply amid low nuclear availability and tight gas markets due to geopolitical events like the Russia-Ukraine conflict.
However, the use of coal comes at a cost. Coal-fired power plants are the largest contributors to the growth in global CO2 emissions. In 2020, the burning of coal emitted 14 billion tonnes of carbon dioxide, accounting for 40% of total fossil fuel emissions and over 25% of total global greenhouse gas emissions. To address this issue, governments and industries are exploring less polluting technologies, such as carbon capture, utilisation, and storage (CCUS). The International Energy Agency's Net Zero Emissions by 2050 Scenario calls for a complete phase-out of unabated coal generation by 2040.
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Coal releases harmful gases and particulates
Coal is a fossil fuel, a carbon-rich material that is usually brown or black and occurs in stratified sedimentary deposits. It is formed out of carbon, and when burned, its carbon combines with oxygen in the air to form carbon dioxide (CO2). CO2 is a heat-trapping, odourless and colourless gas that contributes to global warming and climate change.
The burning of coal releases harmful gases and particulates, which have adverse effects on human health and the environment. The combustion of coal emits toxic airborne pollutants and heavy metals, such as mercury, lead, arsenic, cadmium and nitrogen oxides. These pollutants are linked to a range of health issues, including respiratory illnesses, aggravated asthma, cardiovascular problems, and an increased risk of cancer and premature death.
Mercury, a toxic heavy metal, is of particular concern as it can damage the nervous, digestive and immune systems. It poses a serious threat to child development, with even small amounts in water bodies making fish unsafe for consumption. Coal-fired power plants are responsible for a significant proportion of mercury emissions, with US plants releasing 45,676 pounds of mercury into the atmosphere in 2014.
Sulfur dioxide (SO2) is another significant pollutant produced by burning coal. It combines with other atmospheric molecules to form small, acidic particulates that can penetrate human lungs, contributing to respiratory issues and smog. Additionally, coal mining and power plants impact water bodies, contaminating lakes, rivers, and drinking water supplies with coal ash and pollutants.
Nitrogen oxides emitted from coal combustion contribute to smog and respiratory illnesses. Particulate matter, often referred to as soot, is linked to chronic bronchitis, aggravated asthma, cardiovascular issues, and premature death. Carbon monoxide released during coal burning causes headaches and places additional stress on individuals with heart disease. Furthermore, volatile organic compounds (VOCs) formed during combustion contribute to ozone creation.
While technologies like carbon capture and storage (CCS) aim to mitigate coal's environmental impact, they are expensive and unproven at the scale needed to address climate change. The transition to cleaner energy sources is essential to avoid the worst impacts of coal on human health and the environment.
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Frequently asked questions
Coal is a nonrenewable fossil fuel that is combusted and used to generate electricity.
Coal is formed out of carbon. It is produced by the compaction and hardening of altered plant remains, namely peat deposits.
Coal is a combustible black or brownish-black sedimentary rock.
Coal is obtained through coal mining. Miners dig it up with huge machines, first scraping off the dirt and rock and then digging out the coal.
The extraction and burning of coal are dangerous to miners and hazardous to the environment. It is the largest source of carbon dioxide emissions, contributing to climate change.
