with energy we can keep opening the vein deeper and wider so we will never run out

But locally we can get an energy crisis.

Say that you have a nice mix of wind, solar and hydro. Now climate change moves wind from your wind mills, clouds to your solar and sun to the areas that lead water to your hydro dams. Yes, this can be solved by building new wind, solar and hydro if the geography allows it. But if your currency is denoted in energy, in the meantime the economy will be suffering from deflation (in addition to the energy crisis). That is if you don't get a crisis in confidence - there is not enough energy to back the money!

Sweden's finest (and perhaps only) collaborative, leftist e-newspaper Synapze.se