This example visualizes carbon dioxide emissions in thousand metric tonnes for the top ten U.S. states during electricity generation in 2019, using a horizontal bar chart rendered with React and SVG. The chart displays state names on the y-axis and emission values on the x-axis, with blue tick lines for the quantitative scale. The code loads CSV data via `d3.csv`, applies a row-parsing function to convert emissions to numbers, and constructs the visualization using `scaleBand`, `scaleLinear`, and `max` from D3 v5. React state management with `useState` and `useEffect` handles data loading, while React components generate the SVG marks and gridlines.