This example shows a simple world map with countries rendered in light green on a blue spherical background. It uses the Natural Earth projection and loads country boundaries from the world-atlas TopoJSON dataset. The visualization is built with D3 v5, employing `d3.geoNaturalEarth1` for projection, `d3.geoPath` for generating SVG paths, and `topojson.feature` to extract GeoJSON features from the TopoJSON data. Each country is drawn as an SVG path with a black stroke and low opacity.