This interactive scatterplot uses bubbles to explore the link between a car's CO2 emissions and its city fuel consumption, with colors distinguishing fuel types. The visualization is built with the Vega-Lite API, which compiles specifications to Vega for rendering. Data from a Kaggle dataset is loaded via d3.csv. The chart is configured with custom axis styling and font sizes for improved readability. Hovering reveals the fuel type through a tooltip handler.