This example shows a line chart of CO₂ emissions over time, with data spanning from 1960 to 2020. The visualization displays a rising trend in emissions, plotted as a single steel-blue line against axes for year and CO₂ levels. The code loads CSV data using `d3.csv`, then constructs an SVG with `d3.scaleLinear` for both axes and draws the line path via `d3.line`. Axes are rendered with `d3.axisBottom` and `d3.axisLeft`, while text elements add axis labels and a title.