This chart displays projected CO2 emissions in billion metric tons by sector from 2020 to 2030, using grouped bars for each year. It employs D3 v5 with `scaleBand` for both year and sector categories, `scaleLinear` for values, and `scaleOrdinal` for color mapping. The data originates from the US Energy Information Administration via a GitHub Gist, rendered as SVG with axes, a title, and a legend.