This choropleth map displays world countries in green with a dark blue ocean sphere, highlighting each country in red on hover. Using D3 v5 and TopoJSON, it loads world-atlas data (50m resolution) to generate SVG paths via `d3.geoPath` with a `geoNaturalEarth1` projection, matching ISO country IDs to names from a TSV table. The map supports zoom and pan interactions through `d3.zoom`.