Final answer:
Volcanic eruptions release gases that lead to a cooling effect on the climate, such as seen in the 1783 eruptions in Iceland.
Explanation:
When volcanoes release greenhouse gases into the atmosphere, it generally cools the climate due to the haze-effect cooling. For example, the volcanic eruptions in 1783 in Iceland led to lower global temperatures, particularly during winter. The key gases released include sulfur dioxide, which contributes to this cooling effect.
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