World Without Fish by Mark Kurlansky Marine Science Earth Day Lesson is one of the most popular middle school science books that brings awareness to overfishing, biodiversity and ecosystems, toxins in food chains, human ocean pollution, evolution, adaptation, and extinction of the species. Concepts covered: The theory of natural selectionBiologically and commercially extinct fishBiodiversity & ecosystemOver-fishingHuman ocean pollution Effects of toxins in food chainOcean salinity and temper