This choropleth visualizes renewable electricity generation percentages across countries using a Natural Earth TopoJSON world map. It maps each nation's share of renewable power to a YlGnBu color scale. The visualization loads CSV data with ISO3 country codes, joining values to geographic features for color fills. Rendered as SVG, the map displays a graticule overlay and a gradient legend. A tooltip follows the mouse to report each country's percentage value. The implementation uses `d3.geoPath` for map projection, `d3.scaleSequential` for the color scale, and `d3.axisBottom` for the legend.