This area chart visualizes world population growth from 1950 to 2015, using a smooth curve to show the dramatic increase over time. The visualization uses D3.js version 5, with the `d3.area` generator and `d3.curveBasis` for the smoothed path, along with `d3.scaleTime` and `d3.scaleLinear` for the axes. The chart is rendered as an SVG, with gridlines and axis labels styled via CSS. Population data is loaded from a CSV file hosted on VizHub, formatted with a custom tick formatter that converts billions to "B".