This example demonstrates how to create a world map using D3.js, rendering countries with a natural Earth projection. It displays a blue sphere background and green country shapes with subtle black borders. The code uses D3's `geoNaturalEarth1` projection and `geoPath` to generate SVG paths, while the TopoJSON library's `feature` function extracts country boundaries from a world-atlas dataset. The visualization loads geospatial data from a remote JSON file and renders the map entirely as scalable vector graphics.