This example shows a world map rendered as light green countries against a blue sphere, with black country borders at low opacity. It uses D3’s `geoNaturalEarth1` projection and `geoPath` to draw geographic shapes, while `topojson.feature` extracts country polygons from the world-atlas dataset (110m resolution). The SVG is populated asynchronously after fetching the TopoJSON file, and the sphere is drawn first as a filled path. Styling comes entirely from CSS classes.