A pie chart visualizes the top 10 countries by deaths from air pollution in 2020, using colored segments with labels showing death counts in thousands, plus a legend listing country names and values. The example loads CSV data from a GitHub gist via `d3.csv`, calculates the pie layout with `d3.pie()`, and draws the chart using `d3.arc()` on an SVG canvas. Colors are assigned via `d3.scaleOrdinal()` with an explicit array, and all styling is applied through D3 selections and inline attributes.