While volcanoes do emit somewhere between 65 and 319 million tonnes of Co2 a year, humans contribute to roughly ONE HUNDRED TIMES that amount every year. So volcanoes do slightly contribute to global warming technically but are doing nowhere near the damage that humans are.
Ther is a very little participation of volcanic eruption in causing global warming.It is because it releases carbon dioxide which is a very good friend of greenhouse effect.
But otherwise the volcanic gases cool the temperature.The atmospheric gases originate from the interior of the earth. Most of the material that comes out when the volcano erupts is water vapor, but the rest are gases. The warming of the earth could cause the levels of the oceans to rise.The amount of cooling is determined by how much gas the volcano releases. The more gas it releases, the wider the cooling effect.
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