This horizontal bar chart displays 2010 population figures for 20 countries, with countries arranged along the y-axis and population values mapped to the x-axis. The bars are rendered as light green rectangles using SVG. The implementation builds on D3 v7, employing `d3.scaleLinear` and `d3.scaleBand` for scales, `d3.axisBottom` and `d3.axisLeft` for axes, and `d3.csv` to load data from a GitHub-hosted CSV file. X-axis ticks are formatted with `d3.format` to display values in billions.