Ten of the best books with fictional apocalypses...graded for plausibility

At the B&N Sci-Fi & Fantasy Blog Jeff Somers tagged ten top books with fictional apocalypses...and gave them a plausibility grade. One title on the list:The Children of Men, by P.D. James

The apocalypse James imagines is a slow strangulation of the human race through the simplest manner possible: sterility. While the ultimate cause for the human race’s inability to reproduce isn’t explored in