This area chart visualizes yearly global CO₂ emissions in million metric tons, sourced from a CSV file via a GitHub Gist URL. The chart uses a steelblue semi-transparent fill to depict the trend over time. Constructed with D3 v6, the code parses the data, sets up linear scales for both axes, and generates the area shape using the `d3.area` API. It renders axes with `d3.axisBottom` and `d3.axisLeft`, and applies custom labels, all within an SVG canvas.