This book examines the environmental impact of emissions from ships, setting out the mandatory regulations of MARPOL 73/78 and the Shipboard Energy Efficiency Management Plan, as well as new International Maritime Organization regulations such as MEPC 80. Chapters provide an in-depth understanding of how ship staff can increase energy efficiency by reducing fuel consumption and using innovative technologies. Comprehensive coverage of energy audit methodology is offered to ensure compliance with energy efficiency requirements. Written accessibly to suit a wide range of readers in the shipping industry, the book will be especially valuable for ship officers as well as trainees and cadets.