This fork of a pie chart visualizes energy data from a CSV file, showing CO2 emissions by year. The chart automatically detects categorical and numeric columns, aggregates values using `d3.rollup`, and displays the top 10 categories with an "Other" grouping. Slices and labels are rendered as SVG paths using `d3.arc` and `d3.pie`, with a pastel color scale and a legend. Data comes from Energy_CO2.csv with GDP, CO2, energy consumption, and life expectancy fields.