I believe the stage we're entering hasn't been named yet because it hasn't happened lately.
Every empire that has ever come into existence has collapsed when the demand for energy has outstripped the supply of energy.
In other words, all previous empires have gotten "too big for their britches" and kind of fallen apart. They expanded too fast, squandered resources, ticked off too many people at once, got self righteous, too murderous, etc. and eventually couldn't support all the efforts on all the fronts.
I'm thinking our empire has reached the point of collapse, something that has always happened, but this time there is a fundamental difference between this collapse and the previous ones.
The other empires collapsed when they couldn't supply food, ammuntion, clothes and other essentials to the troops and the colonizing forces and the people, etc.
the difference is that the previous empires relied on the energy provided by renewable energy resources to maintain themselves, their infrastructure, their food supply and their aspirations for growth.
When those empires began to starve for energy (for whatever reason) they collapsed, couldn't maintain the expansion, couldn't keep the infrasturcture maintained, and kindly fizzled out. During and after the collapse, the renewable resources were still available to individuals and smaller groups/ towns to carry on with life as it had been. The collapse was simply the lack of surplus energy to continue investing in expansion or in maintenence of the infrastructure and a recession back to something sustainable.
For the past hundred years, the growth of this empire has been been fueled by an unlimited supply of a highly concentrated energy (oil) that has been available essentially for free. The expansion of this empire has been unstoppable as a result and it has grown to be the worlds first truly globlal empire as well. We have had an unlimited supply of concentrated energy that is transportable anywhere. We have used it to essentially strip the earth of much of the resources it holds...copper, iron, minerals, coal, the rest of the oil, etc. We have also had 3 generations of people know nothing other than an unlimited supply of cheap energy. We have forgotten how to survive on renewable resources over the past few generations. The knowledge gained about how to survive on our own since the dawn of time has been lost. As we exhaust this energy supply, ther is essentailly no limit to haow far back we will need to recede before we reach sustainable. We haven't done that in our lives, neither did our parents, or their parents, really. Not really in the sense that many of us would die the first winter we didn't have magically presurized hot water piped into magically self warming houses and a weekly ride to and from a grocery store magically full of food whenever we want it.
Another significant difference between our collapse and the previous ones is the speed with which this one will likely happen. Rome and Greece and Egypt and the Mayans, etc. slowly crashed over a hundred years or more. They experienced a long slow permanent recession fueled by the ability of everyone to survive on their own wits and their own experience and their own fuel supplies as they had always done. We have no such wits or experience or abilities ot use the fuel supplies at hand. Our extravagent excesses are fueled by oil. Our food, clothing and shelter are also fueled by oil. We've never known any different.
I believe this recession is the beginning of the permanent collapse of this empire. I pretend I'm one of the ones who is doing something about it. I'm kidding myself to think I could survive my first winter if my empire collapsed faster than I was prepared for it to do so.
Recession? Depression? First (and last) global collapse? Just words, really. Just thoughts and theories, too.