This book traces the evolution of ocean current research, highlighting the importance of a comprehensive understanding for predicting future climate scenarios and addressing challenges like sea-level rise. Specific chapters delve into major systems such as the Gulf Stream and Pacific Ocean gyres. By synthesizing published research and integrating insights from climate models, the book offers a holistic view of ocean current behavior and their potential to trigger abrupt climate shifts, making it a valuable resource for students, researchers, and policymakers.