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

0 marked solved

7 registered profiles

We haven't found an affordable substitute for cement that doesn't release as much carbon.

open Global / Unspecified, Global

Cement production alone accounts for a huge share of global carbon emissions, yet it remains central to nearly all construction. A low-carbon alternative that's just as strong and cheap would be one of climate policy's biggest wins.

WS00050 · Logged by Administrator on 2026-07-18T19:09:29Z · Working on: 0

Citation ID: WS00050 Title: We haven't found an affordable substitute for cement that doesn't release as much carbon. URL: https://worldsolve.org/index.php?api=problem&id=50

Log in

Register

Repository Status

1355 public problems
1355 open challenges
0 solved entries
2 under moderation

Filtering Tips

Search by title keyword, country, or theme.
Use category + continent together for better narrowing.
Click any citation code to copy a direct reference format.