A map of the world is drawn using an SVG projection, with countries filled in green and outlined in black against a light teal ocean sphere. The visualization fetches country boundaries from the world-atlas TopoJSON dataset via a URL, then converts them to GeoJSON using the `feature` method. The map renders with the `geoNaturalEarth1` projection and `geoPath` from D3 v7, appending separate path elements for the sphere outline and each country.