This example renders a world map using D3.js and TopoJSON, displaying country boundaries as light green polygons on a light blue sphere outline. The code demonstrates multiple geographic projections—Mercator, Orthographic, Stereographic, and Natural Earth—by sequentially assigning them to a single `d3.geoPath` generator, though only the final Natural Earth projection is visualized. Country features are loaded from the `world-atlas` dataset via `d3.json` and converted with TopoJSON’s `feature` method. The map is drawn as SVG paths with light styling for stroke and opacity.