The CIA classified a book "Adam and Eve" in 1966 outlining the end of the world. The recent release of this heavily scrubbed book is interesting as its timing and content coincides with recent growing evidence and insight into earths 12,000 year catastrophic cycle that ends all life on our planet like clockwork. I can't embed but this is a good 25min watch.
https://youtu.be/wvjJqIXYT1w