This interactive choropleth map compares fuel and crude oil consumption across European countries during the spring of 2020. A slider lets users switch between April, May, and June to update both the colored country regions and the overlaid graduated circles, which represent fuel and crude oil values. The visualization uses D3 v5 with a geoAzimuthalEqualArea projection, geoPath for rendering TopoJSON boundaries, and scaleSqrt for circle sizing. A separate color legend and D3 zoom functionality are included. Data is loaded from CSV and TopoJSON files.