There was a volcanic eruption in the Aleutian Islands early in August. I didn't see anything about this volcano in the newspaper. Apparently this volcano put one or two million tons of sulfur dioxide into the atmosphere. This is about 1/10th of the amount put into the atmosphere by Mount Pinatubo back in 1992. That event resulted in temporary reduction of the temperature of the earth. There was a lot less sulfur dioxide in this latest volcanic eruption, so it will be interesting to see how it affects atmospheric temperature over the next few months. Here is a site that has more about the volcano and effects of sulfur dioxide on the atmosphere.

http://wattsupwiththat.wordpress.com/2008/08/18/large-atmospheric-sulfur-dioxide-experiment-now-underway-in-the-pacific/#more-2326