I'd like to recommend a couple of series' books I've read in recent years that I really enjoyed. Both were written for "young adult" readers, so you'll find them in the teen section at the library. I
The first one is a story of war and survival. The first book is Tomorrow When The War Began by John Marsden
It takes place Christmastime (summer!) in Australia. A group of young people is on a camping trip, while most of adults (ranchers) are at the big District Fair. One morning, a large air strike and occupying army from an unspecified Asian country invades their district. Most of the men were at the fair, so they were easily captured and confined to the compound. Once the teens realize what's happened, there's lots of adventures as they try to resist the occupation and keep from getting captured. There are six or seven books in the series and my husband and I both enjoyed all of them.
The second one is a Cosmic catastrophe. The first book is called Life As We Knew It by Susan Pfeffer- a large asteroid or comet collides with the Moon and knocks it out of orbit and closer to Earth, touching off earthquakes, tsunamis, volcanoes, and Nuclear Winter! This book is about suburban Americans trying to stay alive. It's a good prep story about what can happen- and what can go wrong (people not working together) I was somewhat upset with one character in the book- a corrupt minister that was surviving at the expense of others. As a stand alone book, it seemed an Anti-Christian message. Then I read the second book, The Dead And The Gone, which is a story of the same catastrophe, as experienced by a Puerto Rican family living in NYC. In this book, religious leaders are sympathetic and laboring hard to care of survivors. I'd welcome a third book, because she gave me lots to think about re: preparation!
"This is my Father's world.
O let me ne'er forget
that though the wrong seems oft so strong,
God is the ruler yet."