This responsive line chart visualizes the Keeling Curve, plotting atmospheric CO2 concentrations over time. The code uses D3’s `scaleTime` and `scaleLinear` for axes, with the `line` generator drawing the trend, while `@curran/responsive-axes` handles label placement and `observeResize` adapts the SVG to the container. A gray inner rectangle highlights the plotting area, and the data comes from the `@curran/keeling-curve-data` package.