CNN featured an article that talks about a few cool sounding animes that cover the topic of apocalypse. It covers Akira, X/1999, Casshern Sins, The End of Evangelion, and High School of the Dead.
http://geekout.blogs.cnn.com/2012/01/06/anime-for-the-apocalypse/?hpt=li_t3
illuminatiwatcher 