books.google.ca - Catastrophes, whether natural or man-made, that could destroy the human race are often dismissed as alarmist or fanciful, the stuff of science fiction. In fact the risk of such disasters is real, and growing. A collision with an asteroid that might kill a quarter of humanity in 24 hours and the rest...http://books.google.ca/books/about/Catastrophe_Risk_and_Response.html?id=SDe59lXSrY8C&utm_source=gb-gplus-shareCatastrophe : Risk and Response
