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

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

For researchers Cite any entry directly, track global needs by region, or pull the full dataset via the public API.

1355 total logged

1355 still open

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We haven't solved how to make air travel low-carbon without making it unaffordable.

open Global / Unspecified, Global

Sustainable aviation fuel and electric planes exist in early forms but remain far more expensive than traditional jet fuel. Making clean flying both effective and affordable is still an open engineering and economic problem.

WS00056 · Logged by Administrator on 2026-07-18T19:15:29Z · Working on: 0

Citation ID: WS00056 Title: We haven't solved how to make air travel low-carbon without making it unaffordable. URL: https://www.worldsolve.org/index.php?api=problem&id=56

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1355 public problems
1355 open challenges
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