This book explores the relationship between climate change and microbial life, highlighting the role of microorganisms in global environmental processes. It introduces key concepts such as microbial ecology, carbon and nitrogen cycles, and environmental microbiology. The text examines how climate change affects microbial diversity, distribution, and activity in various ecosystems, including soil, oceans, and the atmosphere. It also discusses the role of microbes in greenhouse gas production and mitigation. Emphasis is placed on understanding how microbial processes influence climate systems and environmental sustainability. Case studies and recent research developments provide practical insights. By combining theoretical knowledge with real-world applications, the book serves as a valuable resource for students and professionals in environmental science and microbiology.