This example shows the monthly rise in atmospheric CO₂ levels at Mauna Loa from 1958 onward. A single black line traces the seasonal fluctuations and overall upward trend across the time series. Built with React and D3 v7, it loads data from a CSV file, uses `scaleTime` and `scaleLinear` for the axes, and renders the path using `d3.line`. The visualization also includes axis labels and handles missing data points through a custom `lineDefinedValue` filter.