This visualization shows the growth of world population over time, using an area chart filled with maroon. The data comes from a CSV file loaded via `d3.csv`. The code uses `d3.scaleTime` for the time axis, `d3.scaleLinear` for population, and `d3.area` with `curveBasis` to generate a smooth filled path. Axis labels and ticks are rendered with `d3.axisBottom` and `d3.axisLeft`, with population formatted in billions.