This pie chart displays the nuclear energy usage of various countries, with each slice representing a country and its corresponding usage value. The chart is rendered as an SVG using D3 v5, with data fetched as CSV from a GitHub Gist. The code uses `d3.csv` to load the dataset, `d3.pie` and `d3.arc` to compute and draw the slices, and `d3.scaleOrdinal` to assign colors. Each slice displays its value in thousands, and a legend on the right shows country names alongside their usage figures.