This fork renders a horizontal bar chart of population data for 30 countries in 2020, using React to compose an SVG scene. The code imports D3 v5 utilities like `scaleBand`, `scaleLinear`, and `max` to position bars and axes, while custom components (AxisBottom, AxisLeft, Marks) generate tick lines and rectangles. Population values are loaded from a CSV via D3’s `csv` function, then formatted with `format('.2s')` to display billions with a 'B' suffix. The visual emphasizes green bars against a clean white background, with tooltips revealing precise values on hover.