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The eruptive effects were felt worldwide for a full year after the 1980 eruption of Mt. St. Helens. There was enough carbon dioxide as well as sulfur dioxide erupted from the volcano that it was able to measurably reduce global temperatures by 1.5 degrees. The heaviest impacted area from the eruption was the area directly to the north that was part of the blow down zone following the lateral blast from the volcano. There was also however a big impact on the central United States due to the ash fall that killed crops and injured live stock.

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