This area chart displays world population growth from 1970 to 2022, aggregating country-level data from a CSV loaded via `d3.tsv`. The visualization uses `d3.area` and `d3.line` with a monotone curve, rendering an SVG with an axis generated by `d3.axisBottom` and `d3.axisLeft`, plus circles for each data point. The y-axis labels show population in billions, and the x-axis formats years as integers. The chart includes an accessible `<svg>` element with a title and descriptive aria-label.