Bronte Wells
Volcanoes emit carbon dioxide in two ways: during eruptions and through underground magma. Carbon dioxide is released through vents, porous rocks, soils, and water that feeds volcanic lakes and hot springs. While volcanic eruptions can inject significant amounts of carbon dioxide into the atmosphere, human activities emit 60 or more times the amount of carbon dioxide released by volcanoes annually. Large eruptions may match the rate of human emissions for a few hours, but they are too rare and fleeting to rival humanity’s annual emissions. Thus, while volcanoes can impact climate change, human activities are the primary driver.
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What You'll Learn
Human activity emits more carbon dioxide than volcanoes
Human activity emits far more carbon dioxide than volcanoes. While volcanoes emit carbon dioxide during eruptions and through underground magma, human activities, such as the burning of fossil fuels, deforestation, and cement production, have resulted in significantly higher carbon dioxide emissions.
Volcanoes emit carbon dioxide in two ways: during eruptions and through the release of subterranean magma when the volcano is not erupting. While volcanic eruptions can release large amounts of carbon dioxide into the atmosphere, the overall contribution of volcanoes to global carbon dioxide emissions is relatively small compared to human activities.
According to estimates, the world's volcanoes generate about 200 million tons of carbon dioxide annually. In comparison, human activities, primarily the burning of fossil fuels, contribute to approximately 24 billion tons of carbon dioxide emissions each year. This disparity highlights the significant impact of human activities on the environment.
Furthermore, it is important to note that large volcanic eruptions are relatively rare and fleeting. While a massive eruption may match human emissions for a short period, such events are infrequent. On the other hand, human activities consistently emit large amounts of carbon dioxide year after year, with certain individual U.S. states emitting more carbon dioxide annually than all the volcanoes on Earth combined.
Additionally, it is worth mentioning that volcanoes can have both warming and cooling effects on the climate. While carbon dioxide released during eruptions contributes to global warming, volcanic injections of sulfur dioxide into the stratosphere can lead to short-term global cooling. This complexity adds another layer to the understanding of the environmental impact of volcanoes compared to human activities.
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Volcanic eruptions release carbon dioxide and sulphur dioxide
Volcanic eruptions can have a significant impact on the climate by releasing large amounts of volcanic gases, aerosol droplets, and ash into the stratosphere. Two of the most significant gases emitted by volcanoes are carbon dioxide (CO2) and sulphur dioxide (SO2).
Carbon dioxide is a greenhouse gas and is the primary gas blamed for climate change. While volcanic eruptions release carbon dioxide, the amounts are relatively small compared to human activities. For example, in 2010, human activities were responsible for a projected 35 billion metric tons of CO2 emissions, while volcanoes produce less than 1 billion metric tons annually. The 1980 eruption of Mount St. Helens released approximately 10 million tons of CO2 into the atmosphere in just 9 hours, an amount now emitted by humans every 2.5 hours. While large volcanic eruptions can inject significant amounts of carbon dioxide into the atmosphere, they are too rare and fleeting to rival human emissions, which are ceaselessly increasing every year.
Volcanoes emit carbon dioxide in two ways: during eruptions and through underground magma. Much of the carbon dioxide released by volcanoes comes from the degassing of subterranean magma when the volcano is not erupting. It escapes through vents, porous rocks, soils, and water that feeds volcanic lakes and hot springs.
Sulphur dioxide, another gas emitted by volcanoes, can cause global cooling. When sulphur dioxide is injected into the stratosphere, it converts to sulfuric acid, which condenses rapidly to form fine sulfate aerosols. These aerosols increase the reflection of radiation from the Sun back into space, cooling the Earth's lower atmosphere. Several volcanic eruptions during the past century have caused a decline in the average temperature at the Earth's surface for periods of one to three years. For example, the 1991 eruption of Mount Pinatubo injected a 20-million-ton sulphur dioxide cloud into the stratosphere, causing the largest aerosol disturbance of the twentieth century and cooling the Earth's surface by as much as 1.3 degrees Fahrenheit.
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Volcanic carbon dioxide emissions are less than 1% of human emissions
Volcanic eruptions release a large amount of carbon dioxide (CO2) into the atmosphere. However, volcanic carbon dioxide emissions are less than 1% of human emissions. While volcanoes emit carbon dioxide during eruptions and through underground magma, human activities, such as burning fossil fuels, industrial activities, and deforestation, contribute significantly more to global CO2 levels.
According to the U.S. Geological Survey (USGS), the world's volcanoes generate about 200 million tons of carbon dioxide annually. In comparison, human activities, including automotive and industrial processes, emit approximately 24 billion tons of CO2 each year. This disparity highlights that volcanic emissions are a relatively minor contributor to global carbon dioxide levels compared to human emissions.
The impact of volcanic eruptions on climate change is primarily associated with the release of sulfur dioxide and other particles that can reflect sunlight and cause short-term global cooling. While carbon dioxide is a greenhouse gas, volcanic carbon dioxide emissions have not been shown to cause detectable global warming. Large volcanic eruptions, like that of Mount St. Helens in 1980, released about 10 million tons of CO2 in nine hours. However, human activities now emit the same amount in just 2.5 hours, emphasizing the magnitude of human emissions relative to volcanic emissions.
It is worth noting that dormant and active volcanoes continuously emit carbon dioxide through degassing processes. Hundreds of volcanoes worldwide contribute to these emissions, and improved monitoring technologies have helped quantify these emissions more accurately. While volcanic emissions provide insights into natural carbon cycles, human emissions have consistently increased year after year, significantly outpacing volcanic contributions to global CO2 levels.
In summary, while volcanoes emit carbon dioxide and can impact climate change, their emissions are significantly lower than human emissions. Volcanic carbon dioxide emissions represent less than 1% of human emissions, and human activities have a far more substantial impact on the Earth's atmosphere and climate.
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Dormant volcanoes emit large amounts of carbon dioxide
While volcanic eruptions are often discussed in the context of climate change due to their release of carbon dioxide and other gases, human activities emit far more carbon dioxide than volcanoes. In fact, human activities emit 60 or more times the amount of carbon dioxide released by volcanoes annually. This is because, in addition to the carbon dioxide emitted during eruptions, volcanoes also emit carbon dioxide through underground magma, which is released through vents, porous rocks, soils, and water that feeds volcanic lakes and hot springs. This carbon dioxide from underground magma is often released when the volcano is not erupting, meaning dormant volcanoes emit large amounts of carbon dioxide.
For example, the 1980 eruption of Mount St. Helens released about 10 million tons of carbon dioxide into the atmosphere in nine hours, which is the same amount released by humans every two and a half hours. Large, violent eruptions may match the rate of human emissions for the few hours that they last, but they are too rare and fleeting to rival humanity's annual emissions. Several individual U.S. states emit more carbon dioxide in a year than all the volcanoes on the planet combined.
While it is true that volcanoes have occasionally contributed to global warming by producing significant amounts of carbon dioxide and other greenhouse gases over the course of geologic time, current volcanic activity does not occur on the same massive scale. Instead, volcanic eruptions often have the opposite effect, causing short-term global cooling due to the sulfur dioxide, ash, and other particles injected into the atmosphere. This was the case with the 1991 eruption of Mount Pinatubo, which injected a 20-million-ton sulfur dioxide cloud into the stratosphere, causing the largest aerosol disturbance of the stratosphere in the twentieth century and cooling the Earth's surface for three years.
Despite the much larger impact of human activities on carbon dioxide emissions, volcanoes still emit a significant amount of carbon dioxide. The world's volcanoes generate about 200 million tons of carbon dioxide annually, with estimates ranging from 0.13 gigatons to 0.44 gigatons or even as high as 0.6 billion metric tons per year. While this is a small fraction of the carbon dioxide output from human activities, it is still a notable contribution.
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Volcanoes can cause global cooling and warming
Volcanoes emit carbon dioxide in two ways: during eruptions and through underground magma. While human activities emit 60 or more times the amount of carbon dioxide released by volcanoes each year, large, violent eruptions may match the rate of human emissions for the few hours that they last. In 2010, human activities were responsible for a projected 35 billion metric tons of carbon dioxide emissions, while volcanoes produce less than 1 billion metric tons annually.
Volcanoes can influence climate change. 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 little impact on climate change, volcanic gases like sulfur dioxide can cause global cooling. The smallest particles of dust get into the stratosphere and are able to travel vast distances, often worldwide. These tiny particles are so light that they can stay in the stratosphere for months, blocking sunlight and causing cooling over large areas of the Earth. The climactic eruption of Mount Pinatubo in 1991 was one of the largest eruptions of the twentieth century, injecting a 20-million-ton sulfur dioxide cloud into the stratosphere. The eruption cooled the Earth's surface for three years, by as much as 1.3 degrees Fahrenheit at its height. The 1815 eruption of Mount Tambora produced enough ash and aerosols to cancel summer in Europe and North America in 1816.
Volcanic carbon dioxide, a greenhouse gas, has the potential to promote global warming. While the carbon dioxide released in contemporary volcanic eruptions has never caused detectable global warming, it has been proposed that intense volcanic release of carbon dioxide in the deep geologic past did cause global warming and possibly some mass extinctions. This is a topic of scientific debate.
Additionally, volcanoes underneath Antarctica may be melting the continent's ice sheets from below, similar to how warming air temperatures from human-induced emissions erode them from above.
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Frequently asked questions
Volcanoes emit carbon dioxide in two ways: during eruptions and through underground magma. While a single volcano adds about 5.8 million tons of carbon dioxide to the atmosphere each year, human activities emit 60 or more times that amount.
Human activities emit about 29 billion tons of carbon dioxide each year.
No, human activities emit far more carbon dioxide than volcanoes. In fact, it takes only three days for humanity to emit the same amount of carbon dioxide as all the volcanoes on Earth do in a year.
Volcanoes can impact climate change by injecting huge amounts of volcanic gas, aerosol droplets, and ash into the stratosphere during major eruptions. While volcanic gases like sulfur dioxide can cause global cooling, volcanic carbon dioxide is a greenhouse gas that can promote global warming.
Not all volcanoes are actively erupting and emitting carbon dioxide, but persistent degassing occurs around a great number of volcanoes worldwide on a continuous basis. Both active and dormant volcanoes emit carbon dioxide.
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