The global economy and civilization itself can be viewed as ecosystems. From that perspective, the rules that govern adaptive cycles in ecosystems also apply to economies and civilizations. Ecosystems go through cycles consisting of four phases - growth/expoitation, conservation, release and reorganization:

Growth cycles tend to come to an end with a loss of resilience leading to ecosystem breakdown. In the case of a forest that could be forest fires or pest invasions, for a civilization it could be the sorts of economic breakdowns we're seeing now.
The length of the conservation phase depends on the nature of the ecosystem and the rapidity of its expansion in the growth phase. In the case of our civilization, it may not exist at all - we may be going straight from growth to release.
The release phase is where the resources that have been attached during the growth phase are released (possibly in a higher-entropy state as waste) for re-use in the subsequent reorganization phase. In the case of our civilization this release could manifest as the flight from suburbia, the abandonment of factory belts, the disintegration of national infrastructure like road, sanitation and communications systems - a process that John Michael Greer calls "catabolic collapse".
The reorganization phase is whatever the next cycle of civilization will be, depending in large measure on how much of the world's resource base this cycle has converted into unrecoverable waste. For example, the fact that we will have turned most accessible fossil fuels into carbon dioxide may pose a significant constraint on the growth phase of the next round of civilization.
The point I'm trying to make is that, all appearances to the contrary, the current situation is completely normal if you take an ecosystem view of civilization. It tastes like a shit sandwich for two reasons. First, release is an uncomfortable process, whether it's due to a forest fire or an economic breakdown. The second reason is that we thought the rules didn't apply to human beings and their creations. As a result we have been blindsided by the obvious, and perhaps outraged to discover that we're not special in any real way.