Permaculture is a powerful technology for redesigning environments to have dynamic sustainability and meet both human and natural requirements. In my view, it hasn't come close to its potential.
Google "Greening the Desert" for a fascinating experiment that cries out for replication/verification. If generalizable, it points the way to quickly reclaiming huge tracts of desert land (much of which was flourishing with plants earlier in human history), and even creating ecological human villages and cities there. Such land could be reclaimed into rain forest or other desirable ecological conditions, with many positive side effects.
Reclaiming deserts is only one of the potential gifts of permaculture. It also offers some powerful, simple methods to reduce methane production from animal husbandry, to remove pollution from damaged waterways, etc.
Permaculture is designed to include diverse native species in a synergistic relationship, thereby helping to preserve species that may be endangered by monoculture (conventional Western agriculture; often preferred over permaculture due to government subsidies and incomplete understandings of relative efficiency.)
My problem with most permaculture writings is the lack of integration of advanced technologies. Robots can make it far faster to implement and less labor intensive. Likewise, multistory automated agricultural facilities, equipped with LED-based indoor lighting powered by abundant clean energy (as we now know how to do; see my book A Celebration Society).
Such automated food production facilities are generally envisioned as monoculture-based and therefore are not generally attractive to permaculturists, but this is wrong. Such facilities should complement rather than replace the wonderful permaculture concept of self-sustaining "food forests", thereby giving us the advantages of both.
Likewise, aquaponics is a very efficient way to produce protein with a small footprint, and it too can be significantly automated.
All of these ideas can be applied in widely diverse environments and habitats.