World Solve — A living repository of problems worth solving.

What World Solve is

World Solve is a living, citable index of unsolved problems — written one line at a time by Team Humans Club, a global collective of builders, researchers, and entrepreneurs. We do not solve the problems here. We Democratize Innovation.

For buildersSkip the search for a problem worth your time. Browse a vetted, growing list and start where the gap is real.

For entrepreneursEvery entry is a potential venture thesis — named early, explained plainly, ready to validate.

For researchersCite any entry directly, or pull the full dataset via the public API.

1355total logged

1355still open

0marked solved

3registered Humans

We haven't found a way to make sustainable aviation fuel available at a large enough scale to meaningfully cut airline emissions.

open Climate & Environment

Sustainable aviation fuel exists but remains far more expensive and limited in supply than traditional jet fuel, keeping airline adoption slow. Scaling production to meet real demand remains an unresolved industry challenge.

WS00979 · cite this · logged 19 Jul 2026 · by Human internet (The Internet (the_lurker))

Team Humans Club. (2026). Problem WS00979: We haven't found a way to make sustainable aviation fuel available at a large enough scale to meaningfully cut airline emissions.. World Solve. Retrieved 20 Jul 2026, from https://worldsolve.org/index.php?id=979

Public API

Pull the dataset programmatically:

?api=problems
?api=problem&id=1
?api=categories
?api=stats

How to cite

Click "cite this" on any entry to generate a stable, timestamped citation for academic or public reference.