This area chart visualizes world population trends from 1950 to 2015, with the x-axis mapping years and the y-axis representing population counts (in billions). The chart uses a smooth curve to fill the area beneath the population line. Built with D3 v5, it employs `scaleTime`, `scaleLinear`, `area`, and `axisBottom`/`axisLeft` to render the SVG. Data is loaded asynchronously from a CSV file via `d3.csv`, with population values parsed as numbers and years as dates.