This D3.js pie chart visualizes global energy consumption by source, displaying percentage shares for coal, natural gas, hydroelectric, nuclear, and renewables. It renders SVG slices using `d3.pie` and `d3.arc`, with `d3.scaleOrdinal` and `d3.schemeSet2` for color encoding. Labels positioned via `arc.centroid` show source names and percentages, while a legend on the right uses colored rectangles. Data comes from an external CSV file loaded with `d3.csv`.