This choropleth map visualizes a custom Global Renewable Energy Adoption Index, coloring countries by their score on a green sequential scale while leaving countries without data in gray. The visualization uses D3.js (v7) with a Natural Earth projection via `d3.geoNaturalEarth1` and `d3.geoPath`, rendering geographic paths from a TopoJSON file loaded through `d3.json` and processed with TopoJSON. Country polygons are filled based on score thresholds, and hover interactions reveal tooltips with country names and scores. A legend on the left explains the color thresholds and the "No Data" gray.