This stacked bar chart shows the proportional CO2 emissions of four vehicle types—Sedan, SUV, Truck, and Motorcycle—split across four fuel categories: Petrol, Diesel, Electric, and Hybrid. Each horizontal bar is normalized to 100%, with colored segments representing fuel-type proportions. Built with D3 v7, the visualization uses `d3.stack()` to compute stacked series, `d3.scaleBand` for the vehicle-type axis, and `d3.scaleLinear` for the percentage scale. Data comes from a local CSV file, rendered as SVG with a color legend and percentage-formatted x-axis ticks.