This visualization displays projected religious population changes across global regions from 2010 to 2050 using a grouped stacked bar chart. Each bar represents a region, with colored segments corresponding to eight religious categories, allowing comparison of both total population and religious composition over time. The chart uses D3 v7’s `stack` function to generate the stacked series, with `d3.scaleBand` and `d3.scaleLinear` for positioning, and `schemeCategory10` for color encoding. Data comes from the provided CSV file containing regional religious population estimates in millions.