This book explores the interdisciplinary potential of Bacillus sphaericus in microbially induced calcium carbonate precipitation (MICP) as a sustainable method for structural repair and environmental engineering. Bridging microbiology, materials science, and green technology, the work presents detailed insights into the biochemical mechanisms of biomineralization, experimental validations, and field applications in concrete healing, soil stabilization, and eco-friendly infrastructure. It emphasizes the role of microbial solutions in reducing carbon footprints, conserving resources, and aligning with global sustainability goals. Designed for researchers, engineers, educators, and policy advocates, this volume contributes to advancing nature-based, low-impact technologies from laboratory innovation to landscape-scale implementation.