Book excerpt: Environmental Oceanography: Towards a Sustainable Marine Environment is an interactive text and casebook designed to teach students about pressing marine environmental issues using critical thinking and basic math. The text uses an innovative approach to teaching environmental oceanography, consisting of marine environmental issues resented as self-contained analytical exercises, with information and questions on sustainability integrated throughout the text. Appropriate for a wide range of readers, Environmental Oceanography works well as a stand-alone text when supplemented with web-based activities, a lab-based course book, and as a supplement to main texts in oceanography and marine science for those instructors who would like to add an active learning focus to their course. Regardless of whether you are teaching a large or small course, Environmental Oceanography will engage and excite your students and prompt them to think critically about pressing environmental issues.