This pie chart visualizes the top 10 countries by deaths in 2020 due to air pollution, using data from a CSV file fetched from a GitHub gist. Each slice’s angle and color encode the death count, with labels showing values in thousands, and a legend listing countries and their figures. Built with D3 v5, the code uses `pie`, `arc`, `scaleOrdinal`, and `svg.append` to render the chart, drawing paths, text, and legend elements as SVG. The color scheme assigns distinct hues to each country via a hardcoded array.