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Volcanic erpptions can have a short term cooling effect, because the ash they throw up can block out some of the sun's energy. They can also have a very minimal longer term effect because of the carbon dioxide they emit. The major eruption in Iceland in 2010 produced between 150,000 and 300,000 tones of carbon dioxide per day, but this was balanced by a reduction of around 300,000 tonnes per day in human induced emissions of carbon dioxide, because of cancelled airline flights. Compared to annual emissions of 30 billion tonnes of carbon dioxide from burning fossil fuels, these amounts would have no perceptible effect.

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14y ago

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