This module is an activity and film-oriented unit focusing on the importance of mangroves in the South Florida ecosystem. The module is part of a series designed to be used by teachers, students, and community members to help them utilize community resources in developing and teaching environmental concepts and responsibility, and in seeking ways to solve environmental problems. Background information, lesson plans (including procedure for building a mangrove model), and a copy of a pre-post test are provided. In addition to the general information presented in the background information section, six reasons why mangroves should not be allowed to be filled, bull-dozed, or altered in local counties or any other part of Florida are summarized. These reasons focus on mangrove productivity, shoreline protection and stabilization, runoff and pollution trap, wildlife habitat area, mangrove dollar economics, and uniqueness of the mangrove forests. (JN)