Past Peak has been reproducing some old posts here, here and here, which are well worth reading. The point about exponential growth is one that I have only recently grasped solidly, but it's probably the most important thing to understand.
Plus the absolute drop in energy availability coming soon to a city near you.
BTW my learning church sequence begins tomorrow. With any luck, there will be a podcast of it, if I can work out how to change files of one sort into another.