I didn't make that clear before. I could not see reader reviews. It does not exists. Sustaibale menas that things can be carried on for a very long time.
Development can never be sustainable.
Even mental growth is limited. The highest state of bliss is the seventh heaven. There is no eigth heaven. I have transformed myself, consciously deciding to be part of a real solution by selling my car in 1982 and refusing to take a ride for many years. The decision was mine but the motivation was largely a result of my upbringing, not my credit.