Global Spring is a near-future science fiction conworld by Jörg Rhiemeier that lays out a hopefully plausible path of sustainable development. It is intended as a backdrop for stories and a novel, for whose title, Global Spring, the setting is named. There are no conlangs involved here, only some neologisms, and some conmusic. Most of this, however, is still unexplored.
The farther future will be laid out in The Trellis.