JMG's image of rolling boulders downhill to illustrate our energy situation is very effective -- as well as having a certain cultural resonance with its rocky-rolly theme.
In a similar vein, my favorite passage in the "substitution" economic narrative is when Sheik Yamani says "The Stone Age did not end because the world ran out of stones. Nor will the oil age end because we have run out of oil."
Wow, does this guy have a pair, or what!? Of course, the trope is too good to miss for the likes of Thomas Friedman, who picks up on it in his second installment of the "Flat Earth" story,
Hot, Flat and Crowded:
{The Stone Age} ended because people invented alternative tools made of bronze and then iron. Yamani knew that if the oil-consuming countries actually got their acts together to produce renewable energy {etc.}... the oil age would end with millions of barrels of oil still underground, just as the Stone Age ended with a lot of stones still on the ground
And speaking of tropes -- on the very same page, we find the ever-popular favorite, "Econ 101"
"anyone who invokes markets and doesn't want to invoke a price signal failed Econ 101. We invoke the market in energy, but we don't use it. ...You have to have a price signal."
Here's a narrative with almost religious language -- invocation -- and "Econ 101" is the catechism. If we just send the right signals, God will reverse a whole bunch of entropy for us and things will keep running a while longer!