This text presents state-of-the-art research on bioremediation, which is understood as a discipline that uses organisms or their products to reduce or eliminate the adverse effects of pollutants in the environment. Today, there are many research groups that focus on remedying the adverse effects of our industrialised society, which release compounds daily, increasingly polluting the environment. This book compiles the most important work of distinguished scientists around the world who are at the vanguard in this discipline, covering the environments of soil and water, as well as a great variety of micro-organisms and mechanism bioremediators.