The ecological balance and ecosystem stability are duly maintained by nature itself but the emergence of the modern industrial era has disturbed the ecological balance through heavy industrialization, faster growth of means of transportation, rapacious exploitation of resources, unplanned urbanization, etc. Environmental management is thus, the process to improve the relationship between human beings and the environment. Operations research creates mathematical models to maximize efficiency, which in turn reduces cost and minimal usage of resources. In this research paper, we will deeply review the applications of operations research in environmental management by using transportation problems as well as case studies to highlight the impact of operations research on the environment.