Look into “really really free markets”, theyre probably similar to what you’re looking for. Generally, just provide a space/time/event for people to bring the things they don’t need, and enable them to keep in contact if they want to share just as a standard thing.
Well, why don’t you just work on climate solutions at home, and give away your findings for free? Surely it’s better in the hands of humanity rather than someone who’ll only save the environment if it’s profitable?