This example displays a world map in the Natural Earth projection, rendering countries as green polygons with a blue spherical background. It visualizes the topojson-format country boundaries from the world-atlas dataset. The code uses `d3.geoPath` with the `geoNaturalEarth1` projection to generate SVG paths, while the `topojson` library’s `feature` function converts the topojson data into GeoJSON features.