Bioremediation can be defined as any process that uses micro-organisms, fungi, green plants or their enzymes to return the natural environment altered by contaminants to its original condition. This book presents topical research data in the study of bioremediation from across the globe. Topics discussed herein include the bioremediation of nitro-toluenes and their derivatives; advances in the bioremediation of perchlorate; the interaction of copper and chromium with yeasts for potential application on polluted environmental clean ups; biosurfactants in the bioremediation of metals; the use of saccharomyces cerevisiae cells in bioremediation; nitrogen sequestration by salt marshes; bioremediation of chromium contaminated soils by actinomycetes; and bioremediation with marine algae.