This Web Seminar took place on September 28, 2010 from 6:30 p.m. to 8:00 p.m. Eastern Time. Presenting was Dr. Randy Russell, Educational Designer with the Office of Education and Outreach at the University Corporation for Atmospheric Research in Boulder, Colorado. In part two of the series, Dr. Russell presented information used in determining what the climate was like in the past. For more information about this web seminar, its presenter(s), read what participants said about it, and to see and download its PowerPoint slides go here.