This encyclopaedia has been compiled and edited to include valuable and succinct material on environmental sicne. Major concepts included in this are from air pollution, marine pollution, automobile pollution and ohter related fields of pollution. The global jproblem of environmental degradation would throw our very existence in peril, unless proper and timely remedial action is initiated in rights earnest. Now the time has come to plan for the sustainable development in harmony with the environment. This encyclopaeida covers all these aspects. About Author : P. Hotter has had a brilliant academic record. His area of study has been mainly environmental microbiolgoy. He has contirbuted numerous papers in this field in the International Jouranls of repute.