This example renders an interactive world map using D3.js and TopoJSON. It displays all countries as green SVG paths on a blue sphere, with countries highlighted in pink on hover. The map uses the `geoEquirectangular` projection and `geoPath` to draw geographic features from the world-atlas dataset loaded via `json`. The code demonstrates basic D3 data joins with `selectAll`, `data`, and `enter`, and applies styling through CSS classes.