This choropleth map displays world countries as a stylized green landmass on a blue sphere, using a natural Earth projection. It renders with D3’s `geoPath` and `geoNaturalEarth1` projection onto an SVG, powered by TopoJSON world-atlas data. Hovering highlights a country in red, while a tooltip shows the country name from a TSV lookup. Pan and zoom are enabled via `d3.zoom`.