Bronte Wells
Volcanic eruptions release carbon dioxide and other gases into the atmosphere, and it is natural to assume that they are a major contributor to climate change. However, 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, but they are too rare to rival humanity's yearly output. The impact of human activities on the carbon cycle far exceeds that of all the world's volcanoes combined, with some estimates placing it at over 100 times higher. While volcanic eruptions do contribute to an increase in atmospheric carbon dioxide, human activities release an amount equivalent to a Mount Pinatubo-sized eruption twice daily.
| Characteristics | Values |
|---|---|
| Amount of carbon dioxide released by volcanoes each year | Less than 1 billion metric tons |
| Amount of carbon dioxide released by human activities each year | 29-40 billion metric tons |
| Amount of carbon dioxide released by human activities since the start of the Industrial Revolution | More than 2,000 billion metric tons |
| Amount of carbon dioxide released by the 1980 eruption of Mount St. Helens | 10 million tons |
| Amount of carbon dioxide released by the 1991 eruption of Mount Pinatubo | 20 million tons |
| Amount of carbon dioxide released by the 2002 eruption of Mount Etna | 5.8 million tons |
| Amount of carbon dioxide released by 33 measured degassing volcanoes annually | 60 million tons |
| Amount of carbon dioxide released by 150 known degassing volcanoes annually | 271 million tons |
| Amount of carbon dioxide released by 30 historically active volcanoes annually | 6.4 million tons |
| Amount of carbon dioxide released by volcanic lakes annually | 94 million tons |
| Amount of carbon dioxide released by tectonic, hydrothermal, and inactive volcanic areas annually | 66 million tons |
| Amount of carbon dioxide released by mid-ocean ridges annually | 97 million tons |
| Amount of time it takes for human activities to equal the annual CO2 emissions of all volcanoes on Earth | 3 days |
| Amount of time it takes for human activities to equal the CO2 emissions of a Mount St. Helens-sized eruption | 2.5 hours |
| Amount of time it takes for human activities to equal the CO2 emissions of a Mount Pinatubo-sized eruption | Twice daily |
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What You'll Learn
Human activity vs. volcanic CO2 emissions
Human activities emit 60 or more times the amount of carbon dioxide released by volcanoes annually. While violent eruptions may match the rate of human emissions, they are too rare and fleeting to rival humanity’s annual emissions. In fact, several individual U.S. states emit more carbon dioxide in a year than all the volcanoes on the planet combined. Human activities, such as burning coal and other fossil fuels, emitted roughly 40 billion metric tons of carbon dioxide in 2015. Since the start of the Industrial Revolution, more than 2,000 billion metric tons of carbon dioxide have been added to the atmosphere by human activities.
Volcanoes emit carbon dioxide in two ways: during eruptions and through underground magma. While volcanic carbon dioxide is a greenhouse gas with the potential to promote global warming, large eruptions also release volcanic ash and aerosol particles that can reflect sunlight and cool the Earth. For example, the 1991 eruption of Mount Pinatubo cooled the Earth's surface for several years following the eruption.
The impact of volcanic eruptions on climate change is complex. While volcanic carbon dioxide has the potential to promote global warming, the conversion of sulfur dioxide to sulfuric acid in the stratosphere can form fine sulfate aerosols that reflect sunlight and cool the Earth's lower atmosphere. This cooling effect can last for several years after a major eruption, even as rising human greenhouse gas emissions contribute to surface warming.
In summary, while volcanic eruptions can have a significant impact on the climate and inject substantial amounts of carbon dioxide into the atmosphere, human activities emit far more carbon dioxide each year. The ceaseless and increasing rate of human emissions dwarfs the rare and fleeting spikes in carbon dioxide released by volcanic eruptions. Therefore, when considering the impact of human activity versus volcanic activity on climate change, it is clear that human emissions pose a much greater concern.
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Volcanoes' impact on climate change
While volcanic eruptions do contribute to an increase in atmospheric CO2, the impact of human activities on the carbon cycle far exceeds that of all the world's volcanoes. According to the U.S. Geological Survey, the world's volcanoes emit around 0.6 billion metric tons of carbon dioxide per year, while human activities cause about 24 billion tons of CO2 emissions annually worldwide. This means that human activities emit 60 or more times the amount of carbon dioxide released by volcanoes each year.
The discrepancy is even more pronounced when considering the emissions from individual U.S. states, which emit more carbon dioxide in a year than all the volcanoes on the planet combined. Furthermore, while large volcanic eruptions can inject significant amounts of carbon dioxide into the atmosphere, it currently takes humanity just 2.5 hours to emit the same amount as the 1980 eruption of Mount St. Helens.
Volcanic eruptions can have a significant impact on climate change, but the effect is typically short-term cooling rather than warming. This is because volcanic eruptions release large amounts of volcanic gas, aerosol droplets, and ash into the stratosphere. The injected ash falls rapidly from the stratosphere and has little impact on climate change. However, volcanic gases like sulfur dioxide can cause global cooling by increasing the reflection of radiation from the Sun back into space, cooling the Earth's lower atmosphere or troposphere. This effect has been observed following major eruptions such as Mount Pinatubo in 1991, which led to a decrease in average global temperatures of up to 1.3 degrees Fahrenheit for several years.
While carbon dioxide released by volcanoes has not caused detectable global warming, it is important to note that volcanoes can contribute to climate change in other ways. For example, scientists have found that volcanic activity may be contributing to the melting of ice caps in Antarctica, although this is not due to any specific emissions. Additionally, volcanoes emit carbon dioxide not only during eruptions but also through underground magma, which is released through vents, porous rocks, and soils.
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Volcanic ash and pollution
Volcanic eruptions can inject significant amounts of carbon dioxide into the atmosphere. However, human activities emit 60 or more times the amount of carbon dioxide released by volcanoes annually. Large eruptions may match human emission rates, but they are too rare and fleeting to rival humanity's annual emissions. Individual US states emit more carbon dioxide yearly than all the volcanoes on Earth combined.
Volcanoes emit carbon dioxide during eruptions and through underground magma. Carbon dioxide from magma is released through vents, porous rocks, soils, water, volcanic lakes, and hot springs. Volcanic eruptions also release sulphur dioxide, which can cause global cooling. The carbon dioxide released by volcanoes is a greenhouse gas that can contribute to global warming. While volcanic eruptions can impact climate change, they often have the opposite effect of human activities, as other injected particles reflect sunlight and cool the Earth's surface.
Volcanic ash is composed of tiny fragments of jagged rock, minerals, and volcanic glass. These particles are hard, abrasive, and range from coarse grains to fine powder. When dry, volcanic ash can be blown by the wind, spreading pollution to new areas. Ash has been found thousands of kilometres from eruption sites, with smaller particles travelling further. Volcanic ash can severely erode machinery and buildings, causing machinery failure and reducing visibility. It can also contaminate water supplies, irritate eyes and lungs, and pose health risks to people with respiratory issues.
Volcanic ash is challenging to clean up due to its ability to enter various spaces and bind to surfaces. Cleanup requires coordinated community efforts and can be costly and time-consuming. Protective gear and caution are necessary during the cleanup process to avoid health risks and redispersing ash. Volcanic ash has disrupted air travel, and even areas without ash deposits on the ground have experienced flight disruptions due to potential aircraft damage.
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Greenhouse gases
Volcanic eruptions inject huge amounts of volcanic gas, aerosol droplets, and ash into the stratosphere. While the ash falls rapidly from the stratosphere and has little impact on climate change, volcanic gases can significantly influence the climate. For example, the conversion of sulfur dioxide to sulfuric acid, which forms fine sulfate aerosols, increases the reflection of radiation from the Sun back into space, cooling the Earth's lower atmosphere.
Large, violent eruptions may match the rate of human carbon dioxide emissions for a few hours, but they are too rare and fleeting to rival humanity's annual emissions. While volcanic carbon dioxide emissions have never caused detectable global warming, human activities continue to release billions of metric tons of carbon dioxide into the atmosphere each year, with the burning of fossil fuels being a major contributor.
Volcanoes have contributed to global warming over geologic time, with some geologists hypothesizing that a massive flood of lava in Siberia millions of years ago raised global temperatures, causing one of the worst extinction events in Earth's history. However, current volcanic activity does not occur on the same scale, and the warming caused by human-induced greenhouse gas emissions will persist for millennia.
While volcanoes emit greenhouse gases, human activities, particularly the burning of fossil fuels, are the primary drivers of climate change. The increased emission of greenhouse gases, regardless of their origin, can have a significant impact on Earth's climate. Thus, it is crucial to address human activities that contribute to greenhouse gas emissions to mitigate their long-lasting effects on the planet.
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Sulphur dioxide and global cooling
While human activities emit 60 or more times the amount of carbon dioxide released by volcanoes annually, volcanic eruptions can still have a cooling effect on the climate. This is because, in addition to carbon dioxide, volcanoes inject volcanic ash and aerosol particles into the atmosphere. These particles reflect sunlight, reducing the amount of solar radiation that reaches the Earth's surface and leading to a cooling effect.
Volcanoes emit sulphur dioxide (SO2), a chemically active gas that is readily oxidized to sulphuric acid. While trace amounts of SO2 can influence the climate, large volumes of SO2 can result in rapid warming. However, when major volcanic eruptions do not occur for decades or centuries, the atmosphere can oxidize all pollutants, leading to global cooling.
SO2 plays a significant role in initiating and controlling global warming. Once in the atmosphere, SO2 reacts with other molecules to form small particles called sulfates, which have a cooling effect on the planet. Unlike greenhouse gases, these aerosol particles scatter sunlight away from the Earth. They can also transform clouds by creating more surface area for water droplets to attach to, making clouds brighter and more reflective.
The cooling effect of sulphate aerosols partially offsets the warming caused by human activities. According to Jesse Kroll, a professor at MIT, the global cooling effect of sulphate pollution from power plants, vehicles, and other human-made aerosols is estimated to be between 0.2°C and 0.9°C. However, there is uncertainty in this estimate due to the lack of data on pre-industrial aerosol levels.
In summary, while volcanoes emit less carbon dioxide than human activities, they can still influence the climate through the injection of aerosol particles and SO2 emissions. SO2 initiates global climate change and contributes to cooling through the formation of sulphate aerosols. The interaction between volcanic activity and human-made pollutants underscores the complexity of climate change and the ongoing scientific efforts, such as NASA's Aura satellite mission, to understand and mitigate its impacts.
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Frequently asked questions
Volcanoes emit carbon dioxide in two ways: during eruptions and through underground magma. Published scientific estimates of the global CO2 emission rate for all degassing subaerial and submarine volcanoes lie in a range from 0.13 to 0.44 gigaton per year. According to the U.S. Geological Survey, the world's volcanoes generate about 200 million tons of carbon dioxide annually.
Human activities emit 60 or more times the amount of carbon dioxide released by volcanoes each year. Human activities emit around 29 billion tons of CO2 each year. The total annual CO2 emissions from human activities are akin to one or more Yellowstone-sized super eruptions occurring every year.
Yes, volcanoes emit sulphur dioxide, ash, and other particles. These emissions can cause global cooling.
Volcanoes can have both positive and negative impacts on the environment. While volcanic eruptions release pollutants, they can also turn CO2 into stone. Additionally, the basalt rocks formed during eruptions can store CO2 for eternity.
