Earth Science Week, celebrated during the second full week of October, was established by the American Geosciences Institute (AGI) in 1998. This premier outreach program has grown over the years to reach more than 50 million people annually through educational materials, events, school activities, media coverage, and the Web. Sixteen years since its inception, Earth Science Week remains the only major continuous national and international outreach campaign dedicated exclusively to promoting public awareness of the vital importance of the geosciences and stewardship of the planet.