This example visualizes the Keeling Curve, plotting atmospheric CO₂ concentration over time. The data is rendered as a black line chart with a light gray inner plot area, using circles to represent individual data points. The chart employs D3's time and linear scales for axes and displays clear axis labels. The code leverages D3's `scaleTime`, `scaleLinear`, `axisLeft`, `line`, and the `@curran/axis-labels` library to construct the visualization. The plot is built declaratively using a join operation to manage SVG elements. The underlying data source is imported from `@subh3ndu/keeling-curve`.