What is best for a Canadian living in the last decade of the twentieth century—even supposing we could discover what that is—might not be best for a Somali, or for our great-grandchildren, or for the rain forest of the Amazon or the kangaroos of Australia. Decisions about what to do about global warming will therefore be influenced by how much relative weight we give to the ethical interests of Canadians, Somalis, grandchildren, rain forests, kangaroos and a host of other variables. Weighing these competing interests is an exercise in applied ethics. This book examines the role that ethics can and should play in our decisions about how to deal with global warming.