As I've pointed out to the last 50,000 posters or so that have recycled old inane jokes about volcanoes and Kyoto, on balance volcanic activity COOLS the earth.
In fact the lack of large amounts of volcanic ash in the atmosphere since Pinatubo may be a contributor to recent high average temperatures worldwide.
There seem to be a large number of seismic activity around the Ring of Fire this last month, not to mention some hot real estate.