This example visualizes global surface temperature anomalies over time, with each dot representing a monthly observation. The diverging color scale (BuRd) maps positive and negative anomaly values to red and blue, respectively, while a ruleY marks the zero baseline. Built with Observable Plot, the chart dynamically sizes to its container and uses the `@curran/gistemp` dataset. The color legend is positioned in a dedicated margin area, and the y-axis labels the anomaly in degrees Fahrenheit with explicit positive/negative formatting.