Green computing involves developing, designing, engineering, producing, using, and disposing of computing modules and devices to reduce environmental hazards and pollution. Green computing technologies are crucial for protecting the planet from environmental hazards and pollution. This book presents new subjects and innovations in green computing technologies and in green computing and electronics industries. Chapters address such topics as green wearable sensors, variable renewable energy, managing energy consumption using the Internet of Things (IoT) and big data, using forest waste to produce biofuel and biodiesel, green computing in ophthalmological practice, and much more.