St. Croix Environmental Association and University of the Virgin Islands present the Biodiversity Film Fest: PBS Planet Earth Series, which will show the film “On the Brink” from 6-8 p.m. on Thursday, April 22. It focuses on case studies that link armed conflict and political crises with environmental issues such as the loss of grasslands, spreading disease, deforestation, soil erosion, water scarcities, surging populations and global climate change. The program features the work of scientists, community organizers and political leaders, as they grapple with the fact that the world’s political security may be bound up with the quality of the land, air and water. The film will be shown at the UVI Theatre Room 401. It is free to all, and no reservations are required.