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.

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Urban water reuse and recycling infrastructure remains underdeveloped in most Asian cities.

open Asia, Asia

Treated wastewater is rarely reused for non-potable purposes despite growing water stress in many urban areas. Decentralized greywater recycling systems for buildings could meaningfully cut freshwater demand.

climate-environment asia urban water recycling reuse infrastructure remains underdeveloped asian cities treated global-unspecified african systems informal

WS01476 · Logged by Ian Patel on 2026-07-22T13:52:00Z · Working on: 0

Citation ID: WS01476 Title: Urban water reuse and recycling infrastructure remains underdeveloped in most Asian cities. URL: https://worldsolve.org/index.php?api=problem&id=1476

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1962 public problems
1962 open challenges
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