World Solve

The problem of lakes shrinking year after year continues to affect hundreds of millions of people and undermines progress on multiple Sustainable Development Goals. Existing responses remain fragmented, under-resourced and poorly adapted to local contexts. A strong solution must operate effectively under severe constraints of skilled personnel, infrastructure, electricity and connectivity. It should define clear measurable outcomes, identify possible unintended harms, and demonstrate how the intervention can be sustained by local institutions long after initial funding ends.

Future progress on human development and planetary health depends on solving industrial pollution of rivers and lakes. Conventional approaches have proven insufficient. The required intervention must integrate community knowledge, data and appropriate technology while remaining affordable, privacy-preserving and operable with minimal external support. Strong solutions will articulate measurable impact metrics, risk mitigation strategies, and a plan for sustained operation by local actors after the pilot phase.

Sub-glacial lakes and channels affect ice dynamics and unique ecosystems, but access is difficult. Remote sensing and careful drilling campaigns can expand knowledge.

Sub-glacial lakes and channels affect ice dynamics and unique ecosystems, but access is difficult. Remote sensing and careful drilling campaigns can expand knowledge.

Lake Victoria and other water bodies suffer from algal blooms and declining fish stocks due to unregulated pollution. Affordable water-quality sensors could enable community-led monitoring and enforcement.

Global warming is causing Himalayan glaciers to melt rapidly, expanding high-altitude glacial lakes. When natural dams breach, catastrophic floods destroy downstream mountain settlements without adequate real-time warning systems.

Encroachment on natural urban drainage lakes leaves rainwater with nowhere to sink, causing severe flash flooding that shuts down entire economic centers.

Fertilizer runoff from farms feeds harmful algae blooms in nearby lakes, damaging drinking water and local ecosystems. Preventing this at the source remains cheaper than treating it after the fact, but adoption is still limited.

Fertilizer and pesticide runoff from farms create dead zones in rivers and lakes where oxygen levels drop too low to support aquatic life. Preventing this runoff without harming farm productivity remains an unresolved environmental challenge.

Salt and chemicals used to keep roads safe in winter can wash into nearby streams and lakes, harming aquatic life over time. Finding equally effective but less harmful alternatives remains an underaddressed environmental challenge.

Achieving methods for restoring the water quality and ecological function of urban rivers and lakes at meaningful scale demands simultaneous progress in fundamental research, engineering integration and socio-technical systems that work for low- and middle-income settings. Existing efforts remain fragmented relative to the magnitude of the challenge.