Two New Books Confirm Global Warming is Natural; Not Caused By Human Activity Tue Jan 30 2007 10:02:32 ET Two powerful new books say today’s global warming is due not to human activity but primarily to a long, moderate solar-linked cycle. Unstoppable Global Warming Every 1500 Years, by physicist Fred Singer and economist Dennis Avery was released just before Christmas. The Chilling Stars: A New Theory of Climate Change, by Danish physicist Henrik Svensmark and former BBC science writer Nigel Calder (Icon Books), is due out in March. --- break --- Unstoppable Global Warming documents the reality of a moderate,...