This area chart displays global population growth from 1950 to 2015, using maroon-filled area under a curve to emphasize the upward trend. It is built with D3 v5 and rendered as SVG, using `scaleTime` for the year axis, `scaleLinear` for population values, and the `area` generator with `curveBasis` for smoothing. The y-axis labels abbreviate billions with `format('.1s')`. Data comes from the world-population-by-year-2015.csv file.