Alok Jha 
50 Ways the World Could End [EPUB ebook] 
The Doomsday Handbook

Death by Euphoria. Dysgenics. Population Death Spiral. Genetic Superhumans. Geomagnetic Reversal. Galactic Collision. Strangelets. Whether we like it or not, everything’s going to come to a pretty unpleasant halt on our planet at some point in the future. What we don’t know is what form our extinction is likely to take. In this accessible and entertaining book, acclaimed writer Alok Jha explains the head-spinning apocalyptic science behind 50 horrifying doomsday scenarios.