This area chart visualizes world population growth from 1960 to 2015, with the x-axis mapping years and the y-axis showing population in billions. The chart uses a maroon filled area generated with D3’s `area()` and `curveBasis` smoothing, while axes are created via `axisBottom` and `axisLeft`. Data comes from a CSV file loaded with `csv()`, and scales use `scaleTime` and `scaleLinear` with a `nice()` domain.