Hello Calvin - The effect volcanic eruptions have on global or regional climate is a subject of ongoing study. The 1912 eruption of Novarupta (in Alaska), the largest eruption of the 20th century, likely produced a cooler summer in the northern hemisphere. Some Alaskan eruptions do have high rates of SO2 - for example, some analyses suggest that Kasatochi (2008) was the highest since Cerro Hudson (1991). It's important to remember that the SO2 from volcanoes is dwarfed by anthropogenic emissions, however. (http://www.avo.alaska.edu/pdfs/cit5862.pdf ) Hope this is helpful, Cheryl -------- Calvin Kaskey wrote: I have read that only volcanoes near the equator can change global climate. With that said I have also heard that Katla in Iceland has. Can Alaskan volcanoes effect global climate and how much sulfur dioxide do they have compared to other climate change volcanoes like Pinatubo, Krakatoa, etc. -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050