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On average less than 1%. It is estimated that volcanoes emit on average 200 million tonnes of CO2 a year. This includes all volcanoes, hot springs and and undersea hydrothermal vents. Humans emit 26 billion tonnes (2003) a year by burning fossil fuels. The gas burnt onsite at oil wells in gas flares accounts for more CO2 emissions than all volcanoes put together.

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14y ago
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10y ago
  • Total carbon dioxide emissions from volcanoes, between 65 and 319 million tonnes per year.
  • Total carbon dioxide emissions from human activities (burning fossil fuels (coal, oil and natural gas) and land use), 29 billion tonnes per year (2007 figures).

Humans emit 100 times more carbon dioxide than volcanoes.

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Q: How does the amount of carbon dioxide that is emitted by volcanoes compare with the amount of carbon dioxide that is added to the atmosphere as a result of human activities?
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