And we are the first in our industry to earn ISO 14001 certification, the voluntary international standard for environmental quality. For the second consecutive year, the Sustainable USA Network has selected East Liverpool's annual environmental cleanup, which is sponsored by our company and eight other organizations, as an affiliated sustainability event. Last year, the event held a national town meeting in Detroit, which was keynoted by Vice President Gore. Moreover, our door is open for public tours. Thousands of people from around the world have walked through our plant.
Teachers especially appreciate the opportunity.
The majority of our visitors come from the educational community, including graduate and undergraduate students from Duquesne University, the University of Pittsburgh and Carnegie Mellon University. And we do so in a manner that is not harmful to our community.