This area chart displays world population growth from 1950 to 2020, with the filled yellow region rising steadily across the time series. Built with D3 v5, it uses `d3.area()` with a `curveBasis` interpolation, `d3.scaleTime` for the x-axis, and `d3.scaleLinear` for the y-axis. Data comes from the United Nations World Population Prospects 2019, loaded via `d3.csv`.