this book focuses on the various applications of microorganisms for sustainable environment and the reduction of hazardous pollutants released in various forms, including xenobiotics, e-waste, pesticides, insecticides, plastic, heavy metals, paper waste, medical waste, textile dyes, and their impact on environmental and human health. the book involves a series of research reports that explain the application of microbes used to solve real-life issues raised due to changes happening in environment, including pollution, by covering applications, including the use of bacteria, fungi, microalgae and biofilm in the detection and degradation of crude oil, pesticides, dyes, e-waste, heavy metals and other pollutants. it also focuses on integrative strategies in the application of microbial nanomaterials for remediation of pollutant. this material will help environmental scientists and microbiologists to learn about existing environmental problems and suggest novel ways to control or contain their effects by employing various treatment approaches.