This area chart visualizes world population by year, using a filled curve to show the rise in population over time. The chart customizes both the x- and y-axes, with a time scale for years and a linear scale for population values, displayed with tick marks and labeled axes. The data is loaded from a CSV file via d3.csv, and the area path is generated using d3.area with a curveBasis interpolation, rendered as an SVG. The y-axis ticks are formatted to abbreviate large numbers, replacing “G” with “B” for billions.