Sustainable technology encountered during Journey 1 part 1
Separation of internal environments in buildings from the outside ... I have no idea why they do this. Why do they want this area so clean? At the same same it is an area where water is treated, so maybe it is a requirement if an area is used for both recreation and water treatment.
Rape seed oil based jet fuel ... I'm no chemist so I won't pursue that, but it sounds plausible.
Biogas production from sewage treatment ... already being done, so I won't pursue that.
The covers used for growing ... that sort of covering is already available but it is not bio-degradeable as far as I know... on list for further investigation.