World Solve

Parts of the Greenland ice sheet may have already crossed tipping points where melting continues regardless of future emissions cuts. Understanding and potentially slowing this process remains one of climate science's most urgent unresolved challenges.

Sea walls and barriers can protect some areas but often shift flooding risk elsewhere or fail to address long-term relocation needs. A truly sustainable coastal adaptation strategy remains incomplete in most vulnerable regions.

Deforestation and rising temperatures are pushing parts of the Amazon toward a state where it can no longer sustain itself as rainforest. Preventing this shift before it becomes irreversible remains an urgent, unresolved challenge.

Vast amounts of carbon and methane are locked in frozen Arctic soil, and as it thaws, it could release gases faster than current climate models predict. Better prediction tools are needed to understand how much this will accelerate warming.

Bee populations have declined sharply in many regions, partly due to pesticide exposure, threatening the pollination that much of global food production depends on. A farming approach that protects both crops and pollinators remains incomplete.

Vast areas of farmland worldwide have been degraded by decades of intensive use, and restoring their fertility can take years even with the right techniques. Scaling this restoration affordably remains an unresolved agricultural challenge.

Invasive plants and animals introduced by global trade and travel can outcompete native species, sometimes causing lasting ecological damage before anyone intervenes. Effective, scalable methods for controlling their spread remain incomplete.

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.

Vast stretches of ocean lie beyond any single nation's jurisdiction, making it difficult to monitor and stop illegal fishing that depletes fish populations faster than they can recover. Closing this enforcement gap remains an unresolved challenge.

Rising ocean temperatures trigger coral bleaching events that can kill reefs outright if heat stress lasts too long, and current interventions can only help a small fraction of affected reefs. Scaling protection to match the pace of warming remains unresolved.

Many heavily polluted cities in lower-income regions still lack dense, affordable monitoring networks that could help residents and policymakers respond in real time. Closing this data gap remains a persistent public health and environmental challenge.

Washing machines release countless tiny plastic fibers from synthetic fabrics into wastewater, and most filtration systems aren't designed to catch particles this small. This steady stream of microplastic pollution remains largely unaddressed at the source.

Some fish populations have been fished to the point of collapse, and even with strict conservation measures, recovery can take decades longer than demand is willing to wait. Balancing recovery with continued food needs remains unresolved.

Soil erodes far faster than it naturally regenerates in many farming regions, threatening long-term food production capacity. Reversing this imbalance at a global scale remains an unresolved agricultural and environmental challenge.

Crop residue and animal waste could theoretically be converted into biogas or other clean energy sources, but the infrastructure needed remains too costly for many farms to adopt. Scaling this technology affordably remains an unresolved opportunity.

As oceans absorb more carbon dioxide from the atmosphere, they become more acidic in ways that threaten shellfish, coral, and the broader marine food chain. Reversing or even halting this chemical shift remains beyond current technology.

Migratory birds depend on a chain of habitats across multiple countries, and losing even one critical stopover point can threaten an entire species' survival. Coordinating protection across this many jurisdictions remains an unresolved conservation challenge.

Even legally protected forests are frequently logged illegally due to weak enforcement and high demand for timber, undermining conservation efforts on paper. Stopping this in practice, not just in law, remains an unresolved global challenge.

Wetlands absorb floodwater and protect surrounding areas, but they continue to be drained or developed faster than they're restored in many regions. Protecting or rebuilding this natural infrastructure remains an unresolved environmental priority.

Desalination plants typically discharge extremely salty brine back into the ocean, which can harm nearby marine ecosystems if not managed carefully. A cleaner, more sustainable desalination process remains technically unresolved.