Coal production follows the same production curve that oil does, and is still a finite resource that puts out MUCH more pollutants than oil.
The thing about shale extraction and all this other happy crap is that it takes a LOT of energy to get anything out of it, making it very inefficient. Renewables like wind are already close to being competative with coal in terms of cost per MW.
The best way to imagine the return on energy (ROE) is with this example:
You are on a deserted island and the only source of food is fruit that falls out of a group of trees in the middle of the island. Each fruit gives you 500 calories and it takes 10 calories to walk over there, pick it up, eat, and digest it. You need to eat 4 fruits not to starve to death and you use 40 calories to survive, leaving you a lot of time to work on a raft or build your house or whatever.
Now imagine the fruit on the ground is used up or rots. You now have to climb up the tree to get at the fruit. Say for the sake of simplicity that this takes 200 calories per fruit. You know have to eat 6.67 fruits to stay alive, and you have spent 1300+ calories to get your 2000 that you need to live.
It will be the same with the end of the "cheap" oil. Middle east oil gives a return of some 31 barrels of energy for every 1 barrel of energy spent pumping and processing it. One the return ratio starts dropping, as it will sooner than you might think, our energy requirements as a civilization will skyrocket, because we will have to rely on a lot of energy inefficient processes to get it. Fossil fuels will exhaust themselves very quickly.

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