Environmental problems of energy crisis, global warming and climatic change, depleting natural resources and loss of biodiversity remain unresolved and nations still divided over these issues. Kyoto Protocol appears crippled and Rio Declaration not yet enacted by all the concerned parties. This book provides bird’s eye view for all the above problems. This book designed primarily for undergraduate students though it may also serve introductory text to those preparing for their master’s degree. The text is divided in to twenty five chapters. Each chapter discussed elaborately. This book also consists of References and environmental information on cyber space for further readings. Book also provide glossary at end, it helps students for prepare competitive Examinations.