Two interactive stacked bar charts visualize renewable and non-renewable energy production totals and proportions by year, using buttons to toggle between views. The visualization loads CSV data from a GitHub repository and renders it as SVG elements using d3.v6, employing d3.stack, d3.scaleBand, and d3.scaleLinear to construct the charts. The code includes commented-out tooltip functionality and axis labeling, with a fixed y-axis domain for the proportions chart.