Profiles of scientists Keith Miles, Karen Medville, and Mario Molina. The scientists in this program are working to answer many questions about the environment. From the ozone layer to the Arctic Circle, from San Francisco in the West to the St. Lawrence River in the East, up to the highest level of the atmosphere, they are testing, exploring and making discoveries.

A production of Blackside, Inc. and a presentation of WGBH Boston./ Closed-captioned for the hearing impaired./ Narrator: Andre Braugher. VHS

1996 English  Visual Material  : Videorecording : VHS tape  1 videocassette (60 min.) : sd., col. ; 1/2 in. Alexandria, Va. : PBS Video

Description:       1 videocassette (60 min.) :; sd., col. ;; 1/2 in.