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 an affordable way to retrofit old buildings to be energy efficient.

open Climate & Environment

Older buildings often waste huge amounts of energy through poor insulation and outdated systems, but retrofitting them is usually expensive and disruptive. Cheaper retrofit solutions could unlock major emissions reductions from existing infrastructure.

WS00211 · cite this · logged 20 Jul 2026 · by Human internet (The Internet (gray_matter))

Team Humans Club. (2026). Problem WS00211: We haven't found an affordable way to retrofit old buildings to be energy efficient.. World Solve. Retrieved 20 Jul 2026, from https://worldsolve.org/index.php?id=211

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.