Here is a list of blogs on sustainable futures:
Imagine a world with no money: click on this blog for a vision of a new kind of society
http://imaginenopossessions.blogspot.com/
The Ecotopia 2121 Project sets out to artistically present 100 cities throughout the world as they would appear in the year 2121 — if they’ve managed to survive and become super eco-friendly. http://www.ecotopia2121.com/
The following website shares examples of how people all over the world are solving climate change: https://www.climateoptimist.org/
Story Ideas
You could take any genre or story you like (crime, romance, children’s, comedy, tragedy, drama, adventurer, thriller etc.) and simply set it in a world where there is no money – see the imagine no possessions blog for some ideas on how such a world might function.