This Web Seminar took place April 6, 2010 from 6:30 p.m. to 8:00 p.m. Eastern Time. Presenting was Dr. Lisa Gardiner, Educational Designer with the Office of Education and Outreach at the University Corporation for Atmospheric Research in Boulder, Colorado. In part three of the series, Dr. Gardiner presented information about the Earth System. She explained what the system was and how the parts of the system are affected by climate change. 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.