This bar chart visualizes the CO2 emissions of the ten countries with the highest total tax rates, using data from a CSV file hosted on GitHub. It ranks countries by tax rate and displays their corresponding emissions values above each bar. The visualization is built with D3 v7, using `d3.scaleBand` and `d3.scaleLinear` for axes, and includes interactive hover tooltips that reveal the exact tax rate. Bars are rendered as SVG rectangles with dark green styling that brightens on mouseover.