This visualization shows life expectancy across various countries using a bar chart with a sequential color scale. The chart maps average life expectancy values to a light-to-dark green gradient, with color intensity and bar height both encoding the data. Built with D3 v7 and rendered as SVG, it uses d3.scaleSequential with d3.interpolateRgb for coloring, d3.scaleBand for the x-axis, and d3.legendColor from the d3-legend library for the legend. The data comes from a CSV file hosted on GitHub containing country-level expectancy metrics.