The ocean gave rise to life on earth, holds much of its biological diversity, and to this day, sustains it. However, for much of human history, the ocean has been thought of as vast, unmanageable, and its resources inexhaustible. Thus, the ocean has been over-exploited and treated without regard. The consequence is that over the last century, the fundamental nature of the ocean — its physical, chemical, and biological characteristics — has changed, and along with it, its ability to provide humankind with sustenance, livelihoods, and inspiration. In this course, the students will explore the natural history of the ocean, identify threats, and evaluate the range of possible solutions to ensure the long-term sustainability of our ocean world.