I too recently read the book"World Made by Hand" by Kunstler. It was a fun
read about a possible scenario of a post carbon world. He brings up several
possible problems, climate change and widespread diseases making certain
crops difficult to grow is one example. He also touches on some possible
post apocalyptic scenarios. Religious wachos taking over is a common one.
His view of a complete government breakdown seems a bit off the mark,
governments will do anything to maintain power.
All in all a good book. We will be facing problems as the oil runs out but
it will be a slower decline than he proposes and draconian government
measures can be expected.