Book excerpt: This book is about understanding challenges we face today in managing our environment and ensuring sustainability of this Planet. It presents the critical state of our resources and threats to resource security due to overconsumption, pollution, and poor and uneven governance. The book provides the reader a deeper understanding on environmental management and concerns regarding sustainability of the planet. In explaining the issues, -nexus- between issues is emphasized that is generally missed in most of the books with examples and visuals. The role of national governments, business organizations, financing institutions, investors, markets and communities is explained using case studies.