Global environmental change is the term used to describe the large-scale problems that have been created by the ill-judged use of the Earth's resources during the development of industrial society over the past three centuries. As a result of over-exploitation of the water, air and land of the planet, humanity faces climatic change, sea level rise and ozone depletion, species extinctions and the loss of biodiversity, soil erosion and desertification This book covers global change - climate change and sea level rise caused by greenhouse gas emissions and to assist the formulation of sustainable policies. Every effort has been made to cover every aspects of global warming and inculcate authentic data in this book. Despite my sincere efforts, there can be some gaps, mistakes or errors. For this, I will be grateful to all readers especially students and teachers for pointing out the deficiencies and sending their valuable comments and suggestion, so that they can be removed.