This example visualizes world population by year as a smooth filled area chart, with the area rising from zero to peak population and labeled axes for year and population. The SVG rendering uses d3.area with curveBasis for the smoothed path, d3.scaleTime and d3.scaleLinear for the scales, and d3.axisLeft and d3.axisBottom for the tick marks. Population data is loaded via d3.csv from a VizHub-hosted dataset, and the y-axis ticks are formatted to abbreviate billions as "B".