This choropleth map shows the percentage of renewable energy use by country worldwide, using a yellow-green sequential color scale where darker shades indicate higher adoption. It loads country boundaries from the world-atlas TopoJSON dataset and joins them with renewable energy percentages from a GitHub-hosted CSV file. The visualization uses d3.geoNaturalEarth1 for projection, d3.geoPath to render each country as an SVG path, and d3.scaleSequential with an interpolateYlGn interpolator to encode values. An interactive tooltip via SVG title elements reveals exact percentages, while a gradient legend below the map provides a reference scale.