This interactive visualization displays global population estimates for 2018 as proportional circles centered on each country, overlaid on a natural Earth projection map. The map uses D3 v5’s `geoPath` and `geoNaturalEarth1`, while circle radii are scaled with `scaleSqrt` based on UN population data. A zoom behavior lets viewers pan and scale the map, and a custom size legend with tick labels explains the scaling. Countries without data appear in a distinct color, and hovering reveals country names and population figures via SVG `<title>` elements.