World Solve

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.

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.

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.

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.

Ocean shipping produces a significant share of global greenhouse gas emissions, yet the industry has been slower than others to adopt cleaner fuel alternatives at scale. Speeding up this transition remains an unresolved climate challenge.

Kelp forests support diverse marine ecosystems but are increasingly vulnerable to warming waters and invasive species that outcompete them once they weaken. Restoring and protecting these ecosystems at scale remains an unresolved conservation challenge.

Many cities lack convenient composting systems, so a significant share of food waste that could be composted still ends up in landfills producing methane. Scaling accessible composting infrastructure remains an unresolved urban sustainability challenge.

Some of the world's largest aquifers are being pumped for irrigation and drinking water far faster than natural processes can refill them. Once fully depleted, these ancient water reserves may take centuries to recover, if they recover at all.