The present book provides comprehensive coverage of the fundamental principles and current practices and trends in the field of natural ecosystem, biodiversity, and global climate change. This book updates the subject matter, illustrations and problems to incorporate new concepts and issues related to natural ecosystem, biodiversity, ecology, environmental pollution and global climate change. Thanks are due to contributors from different institutions and publisher for their interest in this book. I hope this book will provide a multi-disciplinary forum to explore emerging areas in the field of natural ecosystem, biodiversity, ecology, environmental pollution, global warming and global climate change.