This choropleth map displays 2023 population figures for major countries, using a yellow-to-red color ramp to encode population in millions. It renders a Natural Earth world atlas with a natural Earth projection, drawing graticule lines and country polygons as SVG paths via `d3.geoPath` and `d3.geoNaturalEarth1`. Country data comes from a CSV of global metrics, joined to map features by name. Interactive tooltips are implemented with `d3.select` and DOM elements, while a linear color scale (`d3.scaleLinear`) maps population values to the sequential color scheme.