Brian Barton
Fossil fuels, including coal, oil, and natural gas, are the most polluting non-renewable energy sources. They have severe environmental and health impacts, contributing significantly to air pollution, global warming, and climate change. Coal, in particular, is the dirtiest fuel, with pollution levels exceeding its electrical productivity. It accounts for 80% of power plant carbon emissions and leads to soot, smog, acid rain, global warming, and toxic waste. Natural gas, while less polluting than coal, still contributes to air pollution and has environmental and health risks. The extraction and transportation of natural gas result in methane leakage, a potent greenhouse gas. Oil, another well-known fossil fuel, has caused significant pollution in areas like the Ecuadorian Amazon, affecting food, water, and air quality. Nuclear energy, a non-renewable source, has radioactive waste issues and potential accident risks, but it does not emit CO2 or greenhouse gases. Transitioning away from these polluting non-renewable sources towards renewable and cleaner alternatives is crucial to mitigate their adverse effects.
| Characteristics | Values |
|---|---|
| Most pollutant non-renewable energy source | Coal |
| Global CO2 emissions from fossil fuels in 2020 | 91% |
| Fossil fuels as a percentage of global energy production in 2020 | 72% |
| Percentage of global energy production from renewable sources in 2020 | 28% |
| Percentage of world energy consumption from oil | 37% |
| Percentage of US energy consumption from oil | 36.35% |
| Percentage of global primary energy demand from fossil fuels | 80% |
| Global deaths from air pollution per year | 8 million |
| Percentage of the global population living in areas with poor air quality | 91% |
| Remaining oil reserves | 45 years |
| Remaining natural gas reserves | 65 years |
| Remaining coal reserves | 150 years |
| Percentage of power plant carbon emissions from coal | 80% |
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What You'll Learn
Coal is the dirtiest non-renewable energy source
Fossil fuels are the dirtiest and most dangerous energy sources, and among them, coal is the dirtiest non-renewable energy source. It emits much more greenhouse gas than other sources—over a hundred times more than nuclear power. In 2022, coal burning accounted for about 19% of total US energy-related CO2 emissions and about 55% of total CO2 emissions from the electric power sector. Coal is also a major contributor to air pollution, producing soot, smog, acid rain, global warming, and carbon emissions. It also generates a great deal of waste, including sludge, toxic chemicals, and heat.
Coal pollutes during every stage of the energy production process, from mining and transportation to storage and burning. Mountaintop removal and valley fill mining, for example, have severely impacted the Appalachian Mountains in West Virginia and Kentucky. This type of coal extraction involves removing the tops of mountains with explosives, changing the landscape and covering streams with rock and dirt.
Coal usage is on the decline in some countries, with many aging coal plants being shut down and virtually no new coal plants being constructed. However, coal usage across the globe remains about the same, and numerous outlooks predict that the level of global coal consumption could remain fairly stable through 2040. The share of coal in the global energy mix is decreasing due to factors such as cheaper natural gas sources and deliberate policy choices promoting cleaner energy sources.
Income is a key factor in understanding why some countries are moving away from coal. Wealthier populations in developed countries are more likely to express their preferences for a clean environment and are better able to afford more expensive, lower-emission fuels like natural gas and renewables. In contrast, market forces can drive the transition away from coal in both high- and low-income countries if competitively priced alternatives are available. For example, in the US, coal has been largely replaced by cheap natural gas from shale deposits.
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Oil and gas are also highly polluting
Fossil fuels are the most polluting non-renewable energy sources. Coal, in particular, is the dirtiest fuel, producing more pollution than any other energy source. It accounts for 80% of power plant carbon emissions, leading to soot, smog, acid rain, global warming, and carbon emissions. Coal also generates waste, including sludge, toxic chemicals, and heat, polluting the environment at every stage of its production.
Hydraulic fracturing, or fracking, used to extract oil and gas, requires large amounts of water and potentially hazardous chemicals. This process can affect water availability for other uses and harm aquatic habitats. Additionally, it produces large amounts of wastewater, which may contain dissolved chemicals and contaminants, requiring treatment before disposal or reuse. Faulty well construction or improper handling can result in leaks and spills of these fluids, further contaminating the environment.
The presence of oil and gas drilling sites can also degrade the experience of visitors to public lands. The infrastructure associated with drilling, such as oil tanks, power poles, and busy roads, can detract from the natural beauty that hikers and vacationing families expect to find in wildlands. The noise, air pollution, and damaged landscapes caused by drilling can negatively impact local communities that rely on tourism for their economy.
To address the pollution caused by oil and gas, regulations and procedures have been implemented. For example, the U.S. government has established standards for new oil tankers to prevent pollution from ships, and there are regulations in place for plugging and abandoning uneconomic oil and gas wells to prevent leaks and restore well sites. However, more needs to be done to reduce the environmental impact of oil and gas development, and the transition to renewable energy sources is crucial for a cleaner future.
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Fossil fuels cause air pollution and health issues
Fossil fuels, including coal, oil, and natural gas, are non-renewable energy sources that cause significant air pollution and health issues. They are formed from the remains of ancient plants and animals that have been subjected to high heat and pressure underground over millions of years. While they provide a valuable and reliable source of energy, their combustion emits harmful pollutants and contributes to climate change.
The burning of fossil fuels releases toxic particles and gases, such as carbon dioxide, sulfur dioxide, nitrogen oxides, particulate matter, carbon monoxide, and mercury. These pollutants have severe environmental and health impacts. For example, they contribute to air pollution, leading to smog, acid rain, and the pollution of rainwater. Additionally, the absorption of carbon dioxide by the ocean leads to ocean acidification, which alters the ocean's chemistry.
The health consequences of fossil fuel air pollution are extensive. According to various studies, fossil fuel pollution causes approximately 4.5 million to 8.7 million deaths worldwide each year. It is responsible for premature deaths, asthma, cancer, heart disease, and respiratory illnesses. The combustion of fossil fuels produces ultra-fine particles and aromatic hydrocarbons, which are carcinogenic. These pollutants also disproportionately affect children, especially those from underprivileged backgrounds, leading to developmental impairments, cognitive and behavioural disorders, and respiratory issues.
Fossil fuel extraction and transportation processes further contribute to environmental degradation and pollution. Land disturbance for drilling results in erosion and the contamination of nearby water sources. Additionally, the extraction and transportation of natural gas can lead to methane leakage, which is a potent greenhouse gas.
To address these issues, a transition to renewable and clean energy sources is imperative. Sources such as wind, photovoltaic solar energy, solar thermal energy, and hydraulic energy offer alternatives that can reduce air pollution and mitigate the health impacts associated with fossil fuels. By committing to these alternatives, we can prevent premature deaths, reduce pollution, and work towards a more sustainable future for current and future generations.
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Nuclear energy produces radioactive waste
Fossil fuels are the most pollutant non-renewable energy source. Fossil fuels include coal, natural gas, and oil. Coal is the dirtiest fuel, emitting much more greenhouse gas than other sources—more than a hundred times more than nuclear energy. Coal accounts for 80% of power plant carbon emissions and is responsible for soot, smog, acid rain, global warming, and carbon emissions. Natural gas is also a fossil fuel that contributes to air pollution and has environmental and health risks.
Nuclear energy is one of the biggest sources of renewable energy in the world, although it is not entirely clean. Nuclear energy is emission-free and saves about 2.4 billion tons of carbon emissions per year that would otherwise result from coal. However, it does result in radioactive waste.
Radioactive waste is classified as low-level waste or high-level waste. Low-level radioactive waste includes tools, protective clothing, wiping cloths, and other disposable items that become contaminated with small amounts of radioactive dust or particles at nuclear fuel processing facilities and nuclear power plants. High-level radioactive waste consists of irradiated or spent nuclear reactor fuel. The spent reactor fuel is in a solid form and is highly radioactive. It must be stored in specially designed pools of water, which cool the fuel and act as a radiation shield.
The radioactivity of nuclear waste decreases over time through a process called radioactive decay. The amount of time it takes for the radioactivity of radioactive material to decrease to half its original level is called the radioactive half-life. While certain parts of nuclear waste remain radioactive for billions of years, the radioactivity will decay to safe levels within a few hundred years.
The nuclear sector takes full responsibility for all of its waste. Many permanent disposal facilities are in operation for low- and intermediate-level waste, and facilities for high-level waste are under implementation and construction.
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Natural gas creates methane, a greenhouse gas
Fossil fuels are the most pollutant non-renewable energy source. Within the category of fossil fuels, coal is the dirtiest fuel, emitting much more in greenhouse gases than other sources. Oil and gas are also worse contributors to climate change than nuclear and renewable energy sources, but to a lesser extent than coal.
Natural gas is a fossil fuel energy source. It is composed of many different compounds, the largest of which is methane, a compound with one carbon atom and four hydrogen atoms (CH4). Methane is a greenhouse gas that contributes to global climate change. It is the second-greatest greenhouse gas after carbon dioxide. Natural gas is also composed of small amounts of natural gas liquids (NGLs) and non-hydrocarbon gases, such as carbon dioxide and water vapour.
Natural gas is used as a fuel for heating, cooking, and electricity generation. It is also used to make materials and chemicals. Natural gas is found in underground geological formations, often alongside other fossil fuels like coal and oil.
When burned for heat or electricity, natural gas emits fewer toxic air pollutants, less carbon dioxide, and almost no particulate matter compared to other fossil fuels. However, gas venting and unintended fugitive emissions can result in natural gas having a similar carbon footprint to other fossil fuels.
The extraction and consumption of natural gas can result in methane leaks. These leaks contribute to global warming. The US Environmental Protection Agency estimates that about 6.5 million metric tons of methane leak from the oil and gas supply chain each year, around 1% of total natural gas production. However, other scientists have reported much larger figures for methane leaks.
Recent research suggests that the reductions in emissions attributed to the switch from coal to natural gas may be inflated due to the presence of methane. Official government calculations of natural gas's contribution to warming do not account for leaks. Methane is the main component of natural gas, constituting 70% or more of raw natural gas in the ground and well over 95% of the processed gas burned for energy. When burned, methane turns into carbon dioxide, but before then, it can escape into the atmosphere from valves and pipes.
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Frequently asked questions
Coal is the most pollutant non-renewable energy source. It emits much more greenhouse gas than other sources, more than a hundred times more than nuclear power. It also generates a great deal of waste, including sludge, toxic chemicals, and heat. Coal pollutes during every stage of the energy production process, from mining and transportation to storage and burning.
Fossil fuels, including oil and natural gas, are also major contributors to pollution and climate change. Oil is the most well-known energy source globally, and together with fossil fuels, it releases two-thirds of global CO2 emissions. Natural gas, while less polluting than coal and oil, still contributes to air pollution and has environmental and health risks.
Air pollution from burning fossil fuels causes approximately 4.5 million deaths worldwide each year, according to Greenpeace and the Centre for Research on Energy and Clean Air (CREA). Additionally, the World Health Organization (WHO) estimates that about 4.2 million premature deaths occur annually due to exposure to metal particles linked to burning fossil fuels.
Renewable energy sources such as solar power, wind power, hydropower, and nuclear energy are alternatives to non-renewable sources. These sources are safer, cleaner, and have lower environmental impacts.
