This choropleth map visualizes world countries with a green fill and a blue sphere background, using a natural Earth projection rendered to SVG. It draws country boundaries and names from the world-atlas TopoJSON dataset, with each country’s name displayed as a tooltip. The map supports pan and zoom via d3.zoom, and hovering over a country turns it red. The code leverages d3.geoNaturalEarth1, d3.geoPath, and topojson.feature to generate the geographic paths.