This choropleth map visualizes global population distribution using a dark blue color gradient. The map renders world country boundaries with D3’s `geoMercator` projection and `geoPath`, coloring each nation by its population estimate from the world-atlas dataset. Though the code fetches a CSV of tree-cover loss data, the map currently displays population data, not tree cover, as the primary variable. The visualization updates on window resize and includes hover highlighting for countries.