While the idea is not new, Wright identifies the central problem as one of scale and political will. According to him, the error is often to extrapolate from what appears to work well on a small scale to a larger scale, which depletes natural resources and causes
environmental degradation. Large-scale implementation also tends to be subject to
diminishing returns. As overpopulation, erosion,
greenhouse gas emissions, or other consequences become apparent, society is destabilized. In a progress trap, those in positions of authority are unwilling to make changes necessary for future survival. To do so they would need to sacrifice their current status and political power at the top of a hierarchy. They may also be unable to raise public support and the necessary economic resources, even if they try. Deforestation and erosion in ancient Greece may be an example of the latter. A new source of natural resources can provide a reprieve. The European discovery and exploitation of the "New World" is one example of this, but it seems unlikely to be repeated today. Present global civilization has covered the planet to such an extent there are no new resources in sight. Wright concludes that if not averted by some other means, collapse will be on a global scale, if or when it comes. Current economic crises, population problems, and global climate change are symptoms that highlight the interdependence of current national economies and ecologies. The problem has deep historical roots, probably dating back to the origins of life on Earth 3.8 billion years ago. In the
Late Pleistocene, improved hunting techniques in vulnerable areas caused the extinction of many
large prey species, leaving the enlarged populace without an adequate food supply. The only apparent alternative, agriculture, was also a progress trap. Salination, deforestation, erosion, and
urban sprawl led to disease and malnutrition. Almost any sphere of technology can prove to be a progress trap, as in the example of medicine and its possibly inadequate response to the drawbacks of the high-density agricultural practices (e.g.
factory farming) it has enabled. Wright uses weapon technology gradually reaching the threat of total nuclear destruction to illustrate this point. Ultimately, Wright strives to counter at least the Victorian notion of "modernity" as unconditionally a good thing. ==Behavioral causes==