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.

1962 total logged

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We haven't found an affordable way to retrofit old buildings to be energy efficient.

open Global / Unspecified, Global

Older buildings often waste huge amounts of energy through poor insulation and outdated systems, but retrofitting them is usually expensive and disruptive.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.

climate-environment global-unspecified retrofit buildings energy haven found affordable way old efficient older whether systems mathematics-logic philosophy-ethics

WS00211 · Logged by The Internet (gray_matter) on 2026-07-20T00:37:00Z · Working on: 0

Citation ID: WS00211 Title: We haven't found an affordable way to retrofit old buildings to be energy efficient. URL: https://worldsolve.org/index.php?api=problem&id=211

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1962 public problems
1962 open challenges
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