By 2040, cities use live disease forecasts to tune wetlands, mosquito populations, and animal corridors, treating ecological management as a form of public-health infrastructure.
Disease prevention expands from clinics into ecology. Cities treat mosquitoes, wetlands, and migratory corridors as a living early-warning system, then learn to negotiate with the habitats they once managed as empty space. The result is fewer outbreaks and a new civic language in which human health is measured alongside the health of the places that carry it.
At sunrise on a July morning in the Yeosu wetlands, field ecologist Sara Kim releases a tagged swallow and waits to see whether it chooses the restored corridor instead of the highway.
The old choice was between acting too late and accepting uncertainty. The new choice is more generous but not simpler: protecting people means acknowledging that ecosystems have their own thresholds, migrations, and forms of harm.