World Population Area Chart
This SVG area chart, built with D3 v5, displays world population growth over time. The chart uses a time-scaled x-axis for years and a linear y-axis for population, with the area fill rendered via `d3.area` and a basis curve. Data is loaded from a CSV and parsed, with the y-axis formatted using `d3.format` to abbreviate billions. The visualization features labeled axes, a title, and gridlines.