Canwest News Service: Public relations executive James Hoggan says there’s no doubt that his new book is provoking some angry reactions from people with its revelations about what is shaping public opinion on global warming. In fact, the Vancouver businessman says the point of the book, Climate Cover-Up: The Crusade to Deny Global Warming, was to shock people. The book examines the research organizations and academics who question whether human activity is causing dangerous global warming, and trace …